Distance, Time and Speed

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Important Maths Formulas of Distance, Time and Speed

Speed  Speed
Distance Distance = Speed × Time
Time  Time distance
Average Speed  Average Speed
  • To convert a speed in m/s to km/h, multiply by 18/5.
  • To convert a speed in km/h to m/s, multiply by 5/18.
  • Time taken by a train x metres long to pass a stationary object

      = Time Taken by it to cover x metres

  • Time taken by a train x metres long to pass a platform or tunnel y metres long

      = Time taken by it cover (x + y) metres.

  • If two objects are moving in opposite directions towards each other with speeds x km/h and y km/h respectively, then their relative speed is ( x + y) km/h.
  • If two objects are moving in the same direction with speeds x km/h and y km/h respectively, such that x > y, then their relative speed is (x – y) km/h.
  • If the speed of a boat in still water is x km/h and the speed of the stream is y km/h, then:

       Speed downstream = (x + y) km/h

       Speed upstream = (x - y) km/h