Time & Distance

        Time and Distance
Time and Distance

Distance = Speed × Time
     Time and Distance
Time and Distance
  
Points to Remember:
·         Average speed is always equal to total distance travelled to total time taken to travel that distance
·         If certain distance is covered at x km/hr and the same distance is covered at y km / hr then the average speed during whole journey is :
                                                                    2xyx+y kmph

  

Example:
A train covers a distance in 50 min , if it runs at a speed of 48kmph on an average. The speed at which the train must run to reduce the time of journey to 40min will be.

Explanation:
              Time=50/60 hr=5/6hr
              Speed=48mph
              Distance=S×T=48×5/6=40km
              Time=40/60hr=2/3hr
              New speed = 40×3/2 kmph = 60kmph 
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