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How long would it take for ball moving in a straight line

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by AAPL » Wed Jun 20, 2018 2:43 pm

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00:00

Answers

A

B

C

D

E

Stats

Difficulty—

How long would it take for a ball moving in a straight line to travel 246 meters?

1) It takes the ball 2 seconds to make 1 rotation.
2) The ball makes 7 rotations per meter.

The OA is C.

This is my solution,

Statement 1, 2 seconds per rotation, but no info on how many rotations per meter.

Statement 2, rotation per meter but no info on how long per rotation.

1 & 2 together works. Hence, the correct answer is C.

Has anyone another strategic approach to solve this DS question? Regards!
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by Jay@ManhattanReview » Wed Jun 20, 2018 10:47 pm
AAPL wrote:How long would it take for a ball moving in a straight line to travel 246 meters?

1) It takes the ball 2 seconds to make 1 rotation.
2) The ball makes 7 rotations per meter.

The OA is C.

This is my solution,

Statement 1, 2 seconds per rotation, but no info on how many rotations per meter.

Statement 2, rotation per meter but no info on how long per rotation.

1 & 2 together works. Hence, the correct answer is C.

Has anyone another strategic approach to solve this DS question? Regards!
Well, this is all good. :)

-Jay
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