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Two straight railway tracks are at right...

Two straight railway tracks are at right angles to each other. At 7 pm , a train, moving at `30 km*h^(-1)` crosses the junction. Another train, following the other track at `40 km *h^(-1)` crosses the junction at 12 midnight. When are the two trains closest to each other ?

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The correct Answer is:
10.12 pm
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