A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 390 m long?  Select the correct option:  A) 40 sec  B) 60 sec  C) 45 sec  D) 48 sec  E) 50 sec
Speed = 45 * 5/18 = 25/2 m/sec   Total distance covered = 360 + 140 = 750 m   Required time = 750 * 2/25 = 40 sec   ANSWER:60 sec
<result>B</result>
A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 390 m long?