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In a 1 km race, A beats B by 28 meters in 7sec. Find A's time over the course?

5min,4sec
4min,3sec
2min,3sec
3min,4sec

Correct Answer: 4min,3sec

Explanation:

B covers 28 meters in 7sec. So, B's time over the course = (7/28)*100 =250 sec.

Whereas A's time over the course = 250 -7 = 243 sec.

i.e A's time over the course is 4min , 3 sec.

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