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21 Feb 2023, 02:30
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
64% (01:13) correct
36%
(01:40)
wrong
based on 70
sessions
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Carl and Mark run in opposite directions around a stadium. Carl runs at a constant speed, and so does Mark. Carl's speed is how many times Mark's speed?
(1) Mark completes a whole round every 60 seconds.
(2) Carl and Mark meet every 24 seconds.
(1) Mark completes a whole round every 60 seconds.
(2) Carl and Mark meet every 24 seconds.
21 Feb 2023, 05:05
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Carl and Mark run in opposite directions around a stadium. Carl runs at a constant speed, and so does Mark.
Carl's speed is how many times Mark's speed?
(1) Mark completes a whole round every 60 seconds.
No information on Carl's speed is given.
Not sufficient
(2) Carl and Mark meet every 24 seconds.
We don't have any information on the distance covered by Carl and Mark.
They may be covering the same distance if speed are same or different distances if speed is not equal.
Not sufficient
Statement 1 and 2 together.
Let D be distance of one circle. m be speed of Mark and c be speed of Carl.
Mark completes a round in 60 secs => D = m60
Also, that means to cover half the distance he needs 30 secs (speed is constant).
But they meet every 24 seconds => Mark covered little less than D/2 distance say 'd'. d = m24
then Carl covered the D - d distance in 24 seconds
=> D - d = c*24
=> m60 - m24 = c24
=>m36 = c 24
or c = 1.5m
Sufficient
Answer C
Carl's speed is how many times Mark's speed?
(1) Mark completes a whole round every 60 seconds.
No information on Carl's speed is given.
Not sufficient
(2) Carl and Mark meet every 24 seconds.
We don't have any information on the distance covered by Carl and Mark.
They may be covering the same distance if speed are same or different distances if speed is not equal.
Not sufficient
Statement 1 and 2 together.
Let D be distance of one circle. m be speed of Mark and c be speed of Carl.
Mark completes a round in 60 secs => D = m60
Also, that means to cover half the distance he needs 30 secs (speed is constant).
But they meet every 24 seconds => Mark covered little less than D/2 distance say 'd'. d = m24
then Carl covered the D - d distance in 24 seconds
=> D - d = c*24
=> m60 - m24 = c24
=>m36 = c 24
or c = 1.5m
Sufficient
Answer C
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