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?	Choose the correct choice from the following answers.
A) 210
B) 220
C) 230
D) 240
E) 250
distance covered in 1 min=(66*1000)/60= 
<gadget id="calculator">(66*1000)/60</gadget>
<output>1_100</output>
1100m   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=1100/4.4= 
<gadget id="calculator">1100/4.4</gadget>
<output>250</output>
250   ANSW250R:250
<result>E</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 66 kmph?