A train 310 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?
Choose the correct choice from the following.
A) 40 sec
B) 50 sec
C) 44 sec
D) 36 sec
E) 60 sec
Speed = 45 * 5/18 = 25/2 m/sec   Total distance covered = 310 + 140= 
<gadget id="calculator">310 + 140</gadget>
<output>450</output>
450 m   Required time= 450 * 2/25= 
<gadget id="calculator">450 * 2/25</gadget>
<output>36</output>
36 sec   Answer:36 sec
<result>D</result>
A train 310 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?