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