A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?

(a) 40 sec

(b) 42 sec

(c) 45 sec

(d) 48 sec

Formula for converting from km/hr to m/s: X km/hr = (X x 5/18) m/s.

Therefore, Speed = (45 x 5/18) m/sec = (25/2) m/sec.

Total distance to be covered = (360 + 140) m = 500 m.

Formula for finding Time = Distance/Speed

Required time = ((500 x 2)/25) sec = 40 sec.