The radius of the wheel of a bus is 140 cms and the speed of the bus is 66 km/h, then the r.p.m. (revolutions per minutes)of the wheel is	Choose the correct choice from the following.
A) 125 B) 250 C) 300 D) 330 E) None of these
Radius of the wheel of bus = 140 cm. Then,   circumference of wheel = 2Ï€r = 280Ï€ = 880 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   = 880 cm   âˆ´ Revolutions per minute = 6600000/60Ã—880 = 125   125nswer 125
<result>A</result>
The radius of the wheel of a bus is 140 cms and the speed of the bus is 66 km/h, then the r.p.m. (revolutions per minutes)of the wheel is