Question
A man runs round a circular field of radius 50 m at the speed of 12 km/hr. What is the time taken by the man to take twenty rounds of the field ?
Answer: Option D
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Speed = 12 km/hr = `(12 xx 5/18)` m/s = `10/3` m/s.
Distance covered = `(20 xx 2 xx 22/7 xx 50)`m = `44000/7` m
Time taken = Distance / Speed =` (44000/7 xx 3/10) s = ((4400 xx 3)/(7) xx 1/60)` min.
= `220/7` min = `31 3/7` min.
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