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Question

Superman and Batman took part in a race. The race involved going from A to B {1 km straight line} and coming back to A along the same line. Superman ran with a constant speed of 15 m/s both ways. Batman on his way from A to B ran at a constant speed of 10 m/s but on his way back cheated by using his car which moved at a speed of 20 m/s. Who won the race?

A
Batman
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B
Superman
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C
Race ended in a tie
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D
Data insufficient
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Solution

The correct option is B Superman
We will calculate the time taken by Superman and Batman to complete the race. One who took less time won the race.
Superman:
Time taken from A to B=distancespeed=1×10315 s
Time taken from B to A=distancespeed=1×10315 s
Total time in a race=100015+100015=4003=133.33 s
Batman
Time taken from A to B=100010 s
Time taken from B to A=100020 s
Total time in race=100010+100020s=150 s
Superman took less time Superman won the race.

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