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Time and Distance

1. Speed =     Distance/ Time      ,  Time=      Distance/ 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/a:1/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/(_x+y)   km/ hr.
                              

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