Question

a boy is cycling such that The Wheels of the cycle are making 140 Evolutions per minute if the diameter of the wheel is 60 CM calculate the speed kilometre per hour with which the boy is cycling

Answer 1

Distance covered by the wheels in 1 minute = 140× 2¶(60/2) = 8400¶ cm = 26400 cm = 0.264 km

Now, 1 min= 1/60 hr

Speed = 0.264/ (1/60)
= 15.84 km/h