The diameter of the driving wheel of a bus is 120 m. How many revolution, per minute must the wheel make in order to keep a speed of 60 kmph approximately Choose one:
A) 245
B) 257
C) 262
D) 265
E) 275
Explanation:   Distance to be covered in 1 min. = (60 X 1000)/(60) m = 1000 m.   Circumference of the wheel = (2 x (22/7) x 0.60) m = 3.77 m.   Number of revolutions per min. =(1000/3.77) = 265   Answer: Option 265
<result>D</result>
The diameter of the driving wheel of a bus is 120 m. How many revolution, per minute must the wheel make in order to keep a speed of 60 kmph approximately