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Problems on Trains

Q1:

The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:

A 200 m

B 225 m

C 245 m

D 250 m

ANS:C - 245 m

Speed = 45 x 5 m/sec = 25 m/sec.
18 2
  Time = 30 sec. Let the length of bridge be xmetres.
Then, 130 + x = 25
30 2
   2(130 + x) = 750  x= 245 m.



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