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 24 kmph?	Select the correct option:  A) 21.21  B) 22.26  C) 90.9  D) 24.86  E) 25.25
distance covered in 1 min=(24*1000)/60= 
<gadget id="calculator">(24*1000)/60</gadget>
<output>400</output>
400m   circumference of the wheel=(2*(22/7)*.70)= 
<gadget id="calculator">(2*(22/7)*.70)</gadget>
<output>4.4</output>
4.4m   no of revolution per min=400/4.4=90.90   ANSWER:90.9
<result>C</result>
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 24 kmph?