Time and Distance Questions

FACTS  AND  FORMULAE  FOR  TIME  AND  DISTANCE

1.$Speed = \frac{Dis\tan ce}{Time}, Time=\frac{Dis\tan ce}{Speed}, Dis\tan ce= \left(Speed\times Time\right)$ 

2. x km/hr = $\left(x\times \frac{5}{18}\right) m/sec$

3. x m/sec = $\left(x\times \frac{18}{5}\right) km/hr$

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 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 $\frac{2xy}{x+y}$km/hr.