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Q.

Two trains of lengths 180 m are moving on parallel tracks. If they move in the same direction then they cross each other in 15 s, and if they move in opposite directions then they cross in 712 s, then find sum of their speeds (in  m/s).

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answer is 48.

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Detailed Solution

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(vrel)same=v1–v2=36015        .......(1) (vrel)opp.=v1+ v2=3607.5    .......(2) 2v1=360(115+107.5), 2v1=72, v1=36 m/sec, v2=−36015+36=12 m/sec.

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