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 33 kmph?
Options.
A) 210	B) 220	C) 125	D) 240	E) 250
distance covered in 1 min=(33*1000)/60= 
<gadget id="calculator">(33*1000)/60</gadget>
<output>550</output>
550m   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=550/4.4= 
<gadget id="calculator">550/4.4</gadget>
<output>125</output>
125   ANSWER:125
<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 33 kmph?