A man runs round a circular field of radius 50m at the speed of 12 km/hr. What i

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Question
A man runs round a circular field of radius 50m at the speed of 12 km/hr. What is the time taken by the man to take twenty rounds of the field?
Options
A. 220/7 min
B. 110/7 min
C. 90/7 min
D. 230/7 min

Correct Answer

220/7 min

Explanation

speed = 12 km/h = $12 � \frac{5}{18} = \frac{10}{3} m / s$

distance covered = $20 � 2 � \frac{22}{7} � 50 = \frac{44000}{7} m$

time taken = distance /speed = $\frac{44000}{7} � \frac{3}{10} s e c = \frac{4400 � 3}{7} � \frac{1}{60} m i n = \frac{220}{7} m i n$

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