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Two trains 'A' and 'B' of length ' l ' and '4 l ' are travelling into a tunnel of length 'L' in parallel tracks from opposite directions with velocities 108 km/h and 72 km/h, respectively. If train 'A' take 35s less time than train 'B' to cross the tunnel then, length 'L' of tunnel is: (Given L = 60 l )

1. 1200 m
2. 900 m
3. 1800 m
4. 2700 m

Correct answer: 1800 m

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