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Q.

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

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a

2700m

b

1800m

c

1200m

d

900m

answer is A.

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Detailed Solution

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TBTA=354l+L20l+L30=35
64206130×l=35  3×642×6160 ×l=35
19212260×l=35 l=6×5=30

L=60×30=1800m

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