Official Quant thread for CAT 2013

@scrabbler said:
So, let's look at what we know.A starts 0.5 hours before and finishes 0.5 hours fter. So the times taken are 1 hour apart.Abhi tak 2 hours ho gaya for A and 1.5 and total distance is just over 1/3, which means total time should be around 6 times (1.5 to 2) which is 9-12 ke range meinDenominator 30 hai, so I want two consecutive numbers which will lend themselves to 30...is it too much of a stretch to take 9 and 10?So if B takes 9 hours and A 10, let us check - assume 90 ka distance, so B going 10 per hour, A going 9, and in 2 hours A will have done 18 and in 1.5 hours B will have done 15 so total is 33/90 = 11/30 leaving 19/30.Hence 9 hrs and 10 hrs is fine. (Yes, did it orally. Painful though)regardsscrabbler
Sir, tussi great ho
@scrabbler said:
So, let's look at what we know.A starts 0.5 hours before and finishes 0.5 hours fter. So the times taken are 1 hour apart.Abhi tak 2 hours ho gaya for A and 1.5 and total distance is just over 1/3, which means total time should be around 6 times (1.5 to 2) which is 9-12 ke range meinDenominator 30 hai, so I want two consecutive numbers which will lend themselves to 30...is it too much of a stretch to take 9 and 10?So if B takes 9 hours and A 10, let us check - assume 90 ka distance, so B going 10 per hour, A going 9, and in 2 hours A will have done 18 and in 1.5 hours B will have done 15 so total is 33/90 = 11/30 leaving 19/30.Hence 9 hrs and 10 hrs is fine. (Yes, did it orally. Painful though)regardsscrabbler
_______/ \________
u r easily the Aryabhatta of PG... awesome..
Two runners run in the same direction along a circular track 2 km long .The faster runner overtakes the slower one every 30 min .Find their speeds if the faster one completes a round one min sooner than the other
@iLoveTorres said:
Two runners run in the same direction along a circular track 2 km long .The faster runner overtakes the slower one every 30 min .Find their speeds if the faster one completes a round one min sooner than the other
20 and 24?

regards
scrabbler



@scrabbler said:
20 and 24?regardsscrabbler
bhai explain karna thoda
@iLoveTorres Faster is 24 and slower 20
@iLoveTorres said:
Two runners run in the same direction along a circular track 2 km long .The faster runner overtakes the slower one every 30 min .Find their speeds if the faster one completes a round one min sooner than the other
20 and 24
@abhishek.2011 said:
20 and 24
@chhabrakaran29 said:
@iLoveTorres Faster is 24 and slower 20
@scrabbler said:
20 and 24?regardsscrabbler
OA
@albiesriram said:
is the answer 144? jus a wild guess :P
@iLoveTorres said:
Two runners run in the same direction along a circular track 2 km long .The faster runner overtakes the slower one every 30 min .Find their speeds if the faster one completes a round one min sooner than the other
2/(F-S)=1/2
F-S=4

1/F -1/S=1/120

F=24 S= 20

Q.kaushik is 1.5 times more efficient than ravi . kaushik can do a piece of work in 20 days . wht portion of the total work can both of them together complete in 10 days ???


soln needed plz .
@albiesriram 144

@Abir1103 said:
Q.kaushik is 1.5 times more efficient than ravi . kaushik can do a piece of work in 20 days . wht portion of the total work can both of them together complete in 10 days ???soln needed plz .
20*1.5=30
1/20+1/30=1/12
so in 10 days 5/6 th of the work
@Abir1103 said:
Q.kaushik is 1.5 times more efficient than ravi . kaushik can do a piece of work in 20 days . wht portion of the total work can both of them together complete in 10 days ???soln needed plz .
5/6?

P.S did it orally :P
@Abir1103 is the answer 5/6th?

@Abir1103 said:
Q.kaushik is 1.5 times more efficient than ravi . kaushik can do a piece of work in 20 days . wht portion of the total work can both of them together complete in 10 days ???soln needed plz .
20 day ravi does W
1 day ravi does W/20
20 day kaushik does 1.5W
1 day kaushik does 3W/40

(W/20 +3W/40)10
10W/8
5W/4

1.25W/1.5W= 5/6??

@Subhashdec2 sir i'm also getting the same ans......bt in the book the ans is 7/10 . 5/6 even nt in the option
@Dexian said:
2/(F-S)=1/2F-S=41/F -1/S=1/60F=24 S= 20
bhai shouldnt the second equation be 2/F -2/S=1/60?
@Abir1103 said:
@Subhashdec2 sir i'm also getting the same ans......bt in the book the ans is 7/10 . 5/6 even nt in the option
book could be wrong
everyone is getting 5/6 man