Answers

2016-02-22T16:25:22+05:30
Speed = 252 km/hr = 70 m/sec
Time = 20 sec
Distance = speed × time = 70 m/sec × 20 sec = 1400 m  

Circumference of rear wheel = π×diameter = 22/7×84 = 264cm = 2.64m

No. of revolutions that rear wheel makes 
Distance/Circumference
1 5 1