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Puzzle - Hint

A long train, half a kilometre long, is about to enter a long tunnel.

The tunnel is 10k long.

If the speed of the train is 35kph, how long will it take for the entire train to pass through the tunnel - from the front of the train entering to the end of the train leaving the tunnel?

 [Ref: ZRWF]

Hint: Don't forget the length of the train in the tunnel.

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