Question

a car moves from a to b and return back if the returning speed is 10m/s and average speed is 15m/s calculate the speed of car when it went from a to b

Answer 1

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Answer 2

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Here is your answer.

Hello Dear.

Let the Distance between the Station A and Station B is x m.

In First Case(From A to B).
∵ Time = Distance/Speed
  ⇒Time(T₁) = x/10 seconds.

In Second Case(From B to A).
 Time(T₂) = x/20 seconds.

Total Time(T) = T₁ + T₂
= x/10  + x/20
= (2x + x)/20 seconds.

Total Distance = x + x
  = 2x m.

Using the Formula,
 Average Speed = Total Distance/Total Time
 = 2x/(3x/20)
 = 40/3 m/s.

∴ Average Speed of the Train during the Journey is 40/3 m/s.

Hope it helps.

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