A lorry travels at 50 km/h. Given that the diameter of its wheel is 88 cm,find how many revolutions per minute the wheel is turning. GIve your answer to the nearest whole number.

Answer 1

At 50 km/h it travels
5000000/60 cm/min
= 250000/3 cm/min

one rotation is 2π(44) or 88π cm

number of rotations per min
= 250000/3 ÷ 88π
or appr 301 rotations per minute