@ChirpiBird the solution is just right abov your post...check it out
@ChirpiBird said:this is how i did..let number of stairs on escalator and normal stairs be Nv= persons speed. u= escalator speedN/v=20or N=20vnow (N-(N/v)u)/v=30where (N+(N/v)u) is the length of the escalatorsolving we get.. 2u=vnow to get if he's going along the escalator.. he'll travel less distance/climb less stairs.(N+(N/v)u)/v=t20-20*u/v=t20-20*(1/2)=tt=10sectell me where i am going wrong.
apply these changes and check if you are getting the answer
@scrabbler said:Where did this come from?Too many variables....core dump ho raha hai...sorry! regardsscrabbler
see.. N is the number of stairs.. N/v *u is the extra stairs that escalator throws or retracts. (+ or - accordingly. )
pata nahi sir..!! 😞 that's y i take 140 min to do a 70 min QA paper. :(
pata nahi sir..!! 😞 that's y i take 140 min to do a 70 min QA paper. :(
There was a sum in elitmus exam .......... 1024*3672 + 4152*5623 + 6413*5241 .......... this multiplication is in octal form (i.e base 8) ......... The question was ....... How many digit 6 are there in the above multiplication !! ........ Please help me about how to solve this problem !!
@iLoveTorres said:apply these changes and check if you are getting the answer
nahi rey.. this is ryt.
n+(n/v)u means he is going against the escalator. that's y total length of escalator is increasing by (n/v)u ...
n+(n/v)u means he is going against the escalator. that's y total length of escalator is increasing by (n/v)u ...
@nole said:i have posted this 4-5 times before in pg,m posting again coz m not getting it.i hope it doesn't amount to spamming,A teacher wanted to adminster a multiple choice(each question having six choices) based quiz of high difficulty level to a class of sixty students.The quiz had sixty questions.The probability of selecting the correct answer for a good and brilliant student was 0.2 and 0.25 respectively.All the students were seated serially in 10 rows and 6 columns.q) three good students were seated next to each other.What is the probability of them having the same incorrect choice for four consecutive questions ?i did it liketo get one incorrect answer, probabilty is 1/5so all INCORRECT for one student is 1/5*1/5*1/5*1/5so overall for 3 students (1/5*1/5*1/5*1/5)^3 but it is not in options.where did i go wrong ?answer is 4/3125
Ye kaha se aya? Incorrect = 4/5 hoga na?
Ram buys a house for Rs 10,000 and gives it on rent.He puts 12.5% of each month's rent for maintenance and pays Rs 328 in taxes every year. If he receives 5.5% of net profit on his investment,find his monthly rent?
@ScareCrow28 XAT 2013 ka question hai answer 4/3125. mai bohot bari puch chuka ek hi ne bataya abi tak but wo explanation samajh nai aya
ya ya there i m wrong incorrect 4/5 hi hai, but still m not getting answer.
ya ya there i m wrong incorrect 4/5 hi hai, but still m not getting answer.
@ChirpiBird said:nahi rey.. this is ryt. n+(n/v)u means he is going against the escalator. that's y total length of escalator is increasing by (n/v)u ...
I think n+(n/v)u should be replaced by n * v / (v+u) and similarly the other is n * v / (v-u). Try putting those in and see.
regards
scrabbler
regards
scrabbler
@ChirpiBird said:nahi rey.. this is ryt. n+(n/v)u means he is going against the escalator. that's y total length of escalator is increasing by (n/v)u ...
ok if you say that that is right let me use the same and apply
N=20v
(N+(N/v)u)/v=30
i am ending up with u=1.5(v/v+1) how did you get 2u=v?
(N+(N/v)u)/v=30
i am ending up with u=1.5(v/v+1) how did you get 2u=v?
@iLoveTorres said:ok if you say that that is right let me use the same and applyN=20v(N+(N/v)u)/v=30i am ending up with u=1.5(v/v+1) how did you get 2u=v?
put N=20v
N + (N/v)*u =30v
20v + 20u=30v
20u=10v
2u=v
@scrabbler : logic? denominator toh relative speed h.. numerator kya h?
N + (N/v)*u =30v
20v + 20u=30v
20u=10v
2u=v
@scrabbler : logic? denominator toh relative speed h.. numerator kya h?
@scrabbler said:I think n+(n/v)u should be replaced by n * v / (v+u) and similarly the other is n * v / (v-u). Try putting those in and see.regardsscrabbler
If v is say 12 and there are 120 visible stairs to climb on the stationary escalator. Time will be 10 sec. If the escalator speed is u = 4, say, the relative speed is 12 - 4 = 8 and the time taken will be 15 secs. The man will have seen 12 * 15 = 180 steps.
We could directly calculate this as 120 * 12 / (12 - 4) i.e. N * v / (v - u).
Ooops, guess I interchanged the minus and plus above...my bad!
regards
scrabbler
We could directly calculate this as 120 * 12 / (12 - 4) i.e. N * v / (v - u).
Ooops, guess I interchanged the minus and plus above...my bad!
regards
scrabbler
@maroof10 said:Ram buys a house for Rs 10,000 and gives it on rent.He puts 12.5% of each month's rent for maintenance and pays Rs 328 in taxes every year. If he receives 5.5% of net profit on his investment,find his monthly rent?
1046??
@nole said:@ScareCrow28 XAT 2013 ka question hai answer 4/3125. mai bohot bari puch chuka ek hi ne bataya abi tak but wo explanation samajh nai ayaya ya there i m wrong incorrect 4/5 hi hai, but still m not getting answer.
Not able to get the question properly! XAT knows how to confuse with wordings
@ChirpiBird said:put N=20vN + (N/v)*u =30v20v + 20u=30v20u=10v2u=v@scrabbler : logic? denominator toh relative speed h.. numerator kya h?
the mistake you are doing is you arent bringing the relative speed into picture.. the equation should have been N/(v-u)=30 (distance/speed = time)
which will give you v=3u
next N/(v+u)=t ==>20v/(4v/3)=15
which will give you v=3u
next N/(v+u)=t ==>20v/(4v/3)=15
@maroof10 said:Ram buys a house for Rs 10,000 and gives it on rent.He puts 12.5% of each month's rent for maintenance and pays Rs 328 in taxes every year. If he receives 5.5% of net profit on his investment,find his monthly rent?
Shld be 1036..
Let r be the mnthly rent..Total Rent incurred= 12r..
Nw, Rent actually saved = 12r*87.5/100 = 21r/2..
Thus, (21r/2 - 10328)/10000 = 5.5/100
=> 21r/2 - 10328 = 550
=>r = 1036..
@ChirpiBird said:this is how i did..let number of stairs on escalator and normal stairs be Nv= persons speed. u= escalator speedN/v=20or N=20vnow (N+(N/v)u)/v=30where (N+(N/v)u) is the length of the escalatorsolving we get.. 2u=vnow to get if he's going along the escalator.. he'll travel less distance/climb less stairs.(N-(N/v)u)/v=t20-20*u/v=t20-20*(1/2)=tt=10sectell me where i am going wrong.
the problem here is you are taking individual times taken by the escalator and the man and then adding and subtracting 
.. which basically means the man and the escalator are toying with each other :P
.. which basically means the man and the escalator are toying with each other :P@scrabbler said:1036 I thought...regardsscrabbler
Mishtake hui hogi kahi..You did it by thinking sir?? 
@iLoveTorres said:the mistake you are doing is you arent bringing the relative speed into picture.. the equation should have been N/(v-u)=30 (distance/speed = time)which will give you v=3unext N/(v+u)=t ==>20v/(4v/3)=15
N is number of stairs na?
but if he's going along the escalator (same direction) he'll have to climb less steps , right? and if he goes against it, he'll climb more.
in ur equation the more stairs or less stairs is missing. it's stable as N.
but if he's going along the escalator (same direction) he'll have to climb less steps , right? and if he goes against it, he'll climb more.
in ur equation the more stairs or less stairs is missing. it's stable as N.