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?

• ans:250
  distance covered in 1 min=(66*1000)/60=1100m
  circumference of the wheel=(2*(22/7)*.70)=4.4m
  no of revolution per min=1100/4.4=250
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