Time speed, work, Alligations and mixtures problems

srikar2097

Quote:

Originally Posted by minisingh

I got 19 days by conventional method (equating 1 day work) for both man and boy, But i didnt understand how did u equate 12B=8M and then went around.

Kindly elaborate

It's given 13M take 48 days. ----> 1
and 16M + 12B -> 26 days
Assume 16M + xM -> 26 days (where x is men) --->2
on solving 1 and 2 we get x=8
i.e. 8M = 12B

Hope it's clear now? Also, how did you get 19? Post your approach too…

aseem83

yup right..answer would be 11 if we take this matter into consideration that the 5 am trin would cross our train standing at station A while our train would cross 3 pm train standing at platform B...then the answer is 11

loveena.anand

Solve the following questions on Man, hour & work.......

Twenty workers can finish a piece of work in 30 days.After how many days should 5 workers leave the job so that the work is completed in 35 days?
Manoj takes twice as much time as ajay and thrice as much as vijay to finish a piece of work. Together they finish the work in 1 day. What is the time taken by manoj to finich the work?
Raju is twice as good as vijay. Together they finish the work in 14 days. In how many days can vijay alone do the same work?
15 men could finish a piece of work in 210 days . But at the end of 100 days, 15 additional men are employed.In how many more days will the work be complete?
Ajay, vijay & sanjay are employed to do a piece of work for Rs 529. Ajay & vijay together are supposed to do 19/23of the work & vijay & sanjay together 8/23 of work. How much should Ajay be paid?
In a fort there was sufficient food for 200 soldiers for 31 days. After 27 days 120 soldiers left the front . For how many extra days will the rest of the food last for the remaining soldiers?
A,B & C can do some work in 36 days.A & B together do twice as much work as C alone & A & C together can do thrice as much work as B alone. Find the time taken by C to do the whole work?

prakharc

Quote:

Originally Posted by loveena.anand

Solve the following questions on Man, hour & work.......

Twenty workers can finish a piece of work in 30 days.After how many days should 5 workers leave the job so that the work is completed in 35 days?

15 days....

naiquevin

Quote:

Originally Posted by loveena.anand

Solve the following questions on Man, hour & work.......

Twenty workers can finish a piece of work in 30 days.After how many days should 5 workers leave the job so that the work is completed in 35 days?
Manoj takes twice as much time as ajay and thrice as much as vijay to finish a piece of work. Together they finish the work in 1 day. What is the time taken by manoj to finich the work?
Raju is twice as good as vijay. Together they finish the work in 14 days. In how many days can vijay alone do the same work?
15 men could finish a piece of work in 210 days . But at the end of 100 days, 15 additional men are employed.In how many more days will the work be complete?
Ajay, vijay & sanjay are employed to do a piece of work for Rs 529. Ajay & vijay together are supposed to do 19/23of the work & vijay & sanjay together 8/23 of work. How much should Ajay be paid?
In a fort there was sufficient food for 200 soldiers for 31 days. After 27 days 120 soldiers left the front . For how many extra days will the rest of the food last for the remaining soldiers?
A,B & C can do some work in 36 days.A & B together do twice as much work as C alone & A & C together can do thrice as much work as B alone. Find the time taken by C to do the whole work?

1. 15 days
2. 6 days
3. 42 days
4. 55 days
5. 4/23 part of work
6. 10 days
7. 108 days

Gayatri v

HI PUYS CAN U HELP ME WITH THIS

Two typists of varying skills can do a job in 6 mins if they work together.if the first typist typed alone for 4 mins and then the second typist typed alone for 6 mins,they would be left with 1/5 of the whole work.how many minutes would it take the slower typist to complete the typing job alone.

prakharc

Quote:

Originally Posted by Gayatri v

HI PUYS CAN U HELP ME WITH THIS

Two typists of varying skills can do a job in 6 mins if they work together.if the first typist typed alone for 4 mins and then the second typist typed alone for 6 mins,they would be left with 1/5 of the whole work.how many minutes would it take the slower typist to complete the typing job alone.

15 mins

Let speeds be a/min and b/min
So total work= 6(a+b)
and
4a+6b=(4/5)*6(a+b)=>6b=4a or a=3b/2
So time by slow typist 6(b+3b/2)/b=15 mins

srikar2097

Quote:

Originally Posted by Gayatri v

HI PUYS CAN U HELP ME WITH THIS

Two typists of varying skills can do a job in 6 mins if they work together.if the first typist typed alone for 4 mins and then the second typist typed alone for 6 mins,they would be left with 1/5 of the whole work.how many minutes would it take the slower typist to complete the typing job alone.

Given, 1/x + 1/y = 1/6 --->1
and 4/x + 6/y = 4/5

solving both we get 6x = 4y
or x = 2y/3
putting this in (1) and solving for y we get y = 15 min. and x = 10 min.

So the slower of them would finish the job in 15 min.

pranjal215

answer to the second question...
(assuming that c starts to demolish the work when initially there was no work done...)
-1/20(1st day) + (1/10+1/15-1/20)(2 nd day) + (1/10+1/15-1/20) (3rd day)+ ......
first 3 days work=11/60
addind 7/60 * 7=49/60
total 10 dys work gets completed.
so ans 10 days ....

pranjal215

answer to the second question...
(assuming that c starts to demolish the work when initially there was no work done...)
-1/20(1st day) + (1/10+1/15-1/20)(2 nd day) + (1/10+1/15-1/20) (3rd day)+ ......
first 3 days work=11/60
addind 7/60 * 7=49/60
total 10 dys work gets completed.
so ans 10 days ....