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Two trains A and B start simultaneously in the opposite direction from two points A and B and arrive at their destination 9 and 4 hrs respectively after their meeting each other. At what rate does the second train B travel if the fist travel at 80 kmph.

 

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Speed of A/Speed of B= square root(time of B/time of A)

80/x=square root(4/9)

80/x=2/3

x=120km/h
answered ago by (38 points) 1 2

@Learner_jai can you give brief overview how can i derive that relation

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