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Explanation:

Let distance between X and Y be ‘d’ km and train T travels at speed ‘s’ kmph.

Therefore, speed of train S = 34s kmph

At 4 pm, T must have covered ‘s’ km.

Therefore, distance between the two

= (d – s) km

Time taken for the two to cover this distance = d-ss+34s = 4(d-s)7s

Distance covered by train T by now = s + 4(d-s)7s×s = 3s+4d7

By the given condition, 3s+4d7 = 35d

Solving this, we get d = 15s

To travel from X to Y, train T takes 15s/s = 15 hours

Hence, 15.

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