A man runs round a circular field of radius 50 m at a speed of 12km/hr. What time is taken by the man to make twenty rounds of the field ?
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Answer: 31 minutes(approx)
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Step-by-step explanation:
Distance = 2 * pi * r
= 2 * 22/7 * 50 = 100 * 22/7 = 2200/7
Time taken for 1 round = distance/speed
Time taken for 20 rounds = distance/speed * 20
2200/(7*12000)*20 = 0.523 hours(approx) = 31.38 minutes = 31 minutes(approx)
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