Why speed differnece is taken when man and train are in opp. direction?
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When speed is constant distance will vary as time
Car A moves for 2 hours @ 25kmph ---------> d = s X t -------> 50 = 25 X 2
Car B moves for 3 hours @ 25kmph ---------> d = s X t --------> 75 = 25 X 3
Here (tA / tB) = (dA / dB) -----> time ratio = distance ratio = 2 : 3
Car A moves for 2 hours @ 25kmph ---------> d = s X t -------> 50 = 25 X 2
Car B moves for 3 hours @ 25kmph ---------> d = s X t --------> 75 = 25 X 3
Here (tA / tB) = (dA / dB) -----> time ratio = distance ratio = 2 : 3
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Average speed: if both the time taken are equal i.e t1 = t2 = t ,then, t1 + t2 / 2. •. The average .... Time taken by the train to across a man running in the opposite direction. •.
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