(Q) How long will a boy take to run round a square field of side 35 meters, If he runs at the rate of 9 km/hr ?

A) 48 sec
B) 56 sec
C) 52 sec
D) 44 sec

View Answer

B) 56 sec

Explanation :
Speed = 9 km/hr = 9 x (5/18) m/sec = 5/2 m/sec
Distance = (35 x 4) m = 140 m.
Time taken = 140 x (2/5) sec= 56 sec