The radius of the wheel of a bus is 250 cms and the speed of the bus is 66 km/h, then the r.p.m. (revolutions per minutes)of the wheel is	Pick:
A) 70  B) 125  C) 300  D) 500  E) None of these
Radius of the wheel of bus = 250 cm. Then,   circumference of wheel = 2Ï€r = 500Ï€ = 1571.43440 cm   Distance covered by bus in 1 minute   = 66â„60 Ã— 1000 Ã— 100 cms   Distance covered by one revolution of wheel   = circumference of wheel   = 1571.45 cm   âˆ´ Revolutions per minute = 6600000/60Ã—1571.43 = 70   70nswer 70
<result>A</result>
The radius of the wheel of a bus is 250 cms and the speed of the bus is 66 km/h, then the r.p.m. (revolutions per minutes)of the wheel is