Question

A man runs around a circle of radius 50 m at a speed of 12 km/h. The time taken by him for going around it ten times is ....

 (π = 3.14) 

(A) 10 mins 42 secs 

(B) 12 mins 35 secs 

(C) 15 mins 42 secs 

(D) 10 mins 35 secs

Answer 1

The correct option is: (C) 15 mins 42 secs 

Explanation:

Distance covered in one round is 2 x 3.14 x 50 = 314 m

.'. Distance covered in 10 rounds = 3140 m

Speed = 12km/hr = 12 x 5/18m/sec = 10/3 m/sec