The length of the bridge, which a train 130 metres long and travelling at 45 km / hr can cross in 30 seconds, is
Choose the correct choice from the following answers.
A) 200 m	B) 225 m	C) 245 m	D) 250 m	E) None
Sol.   Speed = [45x5/18] m/sec = (25/2)m/sec; Time = 30 sec.   Let the length of bridge be x metres.   Then, 130 + x / 30 = 25 / 2   ⇔ 2(130 + x) = 750   ⇔ x = 245 m.   Answer 245 m
<result>C</result>
The length of the bridge, which a train 130 metres long and travelling at 45 km / hr can cross in 30 seconds, is