2012 · Q26
A wheel of radius 2.1 m of a vehicle makes 75 revolutions in one minute. What is the speed of the vehicle?
Elementary MathematicsMensuration
- A78 kmph
- B59.4 kmph
- C37.4 kmph
- D35.4 kmph
Explanation
Distance per minute = 75*2*pi*2.1 = 990 m, so speed = 990*60/1000 = 59.4 km/h.