IMPORTANT FACTS AND FORMULAE
Distance Distance
1. Speed = Time , Time= Speed , Distance = (Speed * Time)
2. x km / hr = x * 5
18
3. x m/sec = (x * 18/5) km /hr
4. If the ratio of the speeds of A and B is a:b , then the ratio of the times taken by them to cover the same distance is 1: 1 a b
or b:a.
5. Suppose a man covers a certain distance at x km/ hr and an equal distance at y km / hr . Then , the average speed during the whole journey is 2xy km/ hr.
x+y