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) 243 m	B) 240 m	C) 245 m	D) 249 m	E) 242 m
Speed =45 x5/18 m/sec=25/2m/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: