A and S are running a race of 5000 metres. A finishes the race 40 secs before S. If S's speed while running is 25m/sec. what is A's speed
20m/sec
28.75m/sec
31.25m/sec
34.50m/sec
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A and S
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AIM TO CRACK GMAT
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[email protected]
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Hi Aim,
While this question is NOT written in GMAT "style" it is based on the Distance Formula, which you'll use a couple of times on Test Day.
D = R(T)
S's Formula: 5000 = (25m/sec)(T)
T = 5000/25 = 200 seconds
Since A finishes 40 seconds BEFORE T, then....
A's Formula: 5000 = R(160 seconds)
R = 5000/160 = 125/4 = 31.25m/sec
Final Answer:C
GMAT assassins aren't born, they're made,
Rich
While this question is NOT written in GMAT "style" it is based on the Distance Formula, which you'll use a couple of times on Test Day.
D = R(T)
S's Formula: 5000 = (25m/sec)(T)
T = 5000/25 = 200 seconds
Since A finishes 40 seconds BEFORE T, then....
A's Formula: 5000 = R(160 seconds)
R = 5000/160 = 125/4 = 31.25m/sec
Final Answer:C
GMAT assassins aren't born, they're made,
Rich
Last edited by [email protected] on Thu Nov 07, 2013 1:06 am, edited 1 time in total.
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ganeshrkamath
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Time taken by S to cover 5000 meters at 25m/sec = (distance/speed) = 5000/25 = 200 secondsAIM TO CRACK GMAT wrote:A and S are running a race of 5000 metres. A finishes the race 40 secs before S. If S's speed while running is 25m/sec. what is A's speed
20m/sec
28.75m/sec
31.25m/sec
34.50m/sec
Time taken by A to cover 5000 meters = 200 - 40 = 160 seconds
Speed of A = (distance/time) = 5000/160 = 250/8 = 31.25 m
Choose C
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Kelley School of Business (Class of 2016)
GMAT Score: 750 V40 Q51 AWA 5 IR 8
https://www.beatthegmat.com/first-attemp ... tml#688494
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