A train 510 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 answers.
A) 40
B) 52
C) 26
D) 21
E) 14
Speed = 45 * 5/18 = 25/2 m/sec   Total distance covered = 510 + 140= 
<gadget id="calculator">510 + 140</gadget>
<output>650</output>
650 m   Required time= 650 * 2/25= 
<gadget id="calculator">650 * 2/25</gadget>
<output>52</output>
52 sec   Answer:52
<result>B</result>
A train 510 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?