A train 360 m long is running at a speed of 45 km / hr. In what time will be pass a bridge 140 m long?	Answers.
A) 40 sec	B) 42 sec	C) 45 sec	D) 48 sec	E) None
Sol.   Speed = [45x5/18] m/sec = 25/2 m/sec.   Total distance covered = (360 + 140)= 
<gadget id="calculator">(360 + 140)</gadget>
<output>500</output>
500 m.   ∴ Required time= (500 x 2/25)sec = 40 sec.   40 secnswer 40 sec
<result>A</result>
A train 360 m long is running at a speed of 45 km / hr. In what time will be pass a bridge 140 m long?