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Answer:
Length of train T = 100 metres
Length of train U = 150 metres
Length of tunnel = 200 metres
Distance to be travelled by train T to exit the tunnel = 100+200 = 300 metres
Distance to be travelled by train U to exit the tunnel = 150+200 = 350 metres
Speed of train T = 54 Kms/hr =54*(5/18) metres/sec= 15 metres/sec
Time taken for train T to travel 300 metres= 300/15 = 20 seconds
Speed of train U = 90 Kms/hr = 90*(5/18)metres/sec = 25 metres/sec
Time taken for train U to travel 350 metres = 350/25 = 14 seconds
Thus it can be seen that train U will exit the tunnel first. At this time train T will need 6 more seconds to exit the tunnel,that is it has to travel still 6*15 = 90 metres to exit the tunnel or still 90 metres of the train T will be inside the tunnel.
Answer: Option C
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