Two identical trains take 3 sec to pass one another when going in the opposite direction but only 2.5 sec if the speed of one is increased by 50%. Find the time one would take to pass the other when going in the same direction at their original sped.
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Expert's answer
2018-07-02T11:35:08-0400
2s – Lenght of two train Identical trains take 3 sec to pass one another when going in the opposite direction 2s/(v1+v2)=3 if the speed of one is increased by 50% 2s/(1.5*v1+v2)=2.5 the time one would take to pass the other when going in the same direction at their original speed. T=2s/(v2-v1) Having solved the system of equations, we obtain T=15 sec
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