16. The diameter of the driving wheel of a bus in 140 cm. How many revolutions per minute must the wheel make in order to keep a speed of 66 kmph?
Answer:
Distance to be covered in 1 min. = [66*1000/60]m = 1100m
Circumference of the wheel = [2*22/7*0.70]m = 4.4m.
Number of revolutions per min. = 1100/4.4 = 250
