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?
Solution
Correct Answer: Option A
speed = 12 km/h = \(12\times\frac5{18}=\frac{10}3m/s\)
distance covered = \(20\times2\times\frac{22}7\times50=\frac{44000}7m\)
time taken = distance /speed = \(\frac{44000}7\times\frac3{10}sec=\frac{4400\times3}7\times\frac1{60}min=\frac{220}7min\)
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