The radius of the wheel of a bus is 175 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 answer
A) 100	B) 250	C) 300	D) 330	E) none of these

Rationale: "radius of the wheel of bus = 175 cm . then , circumference of wheel = 2 ï € r = 350 ï € = 1100 cm distance covered by bus in 1 minute = 66 â  „ 60 ã — 1000 ã — 100 cms distance covered by one revolution of wheel = circumference of wheel = 1100 cm â ˆ ´ revolutions per minute = 6600000 / 60 ã — 1100 = 100 answer a"
Answer: A