How long does a train 110 m long running at the speed of 72 km/hr takes to cross a bridge 136 m length?
Choose the correct choice from the following answers:
A) 82.1 sec.
B) 12.3 sec
C) 19.1 sec.
D) 17.1 sec.
E) 42.1 sec.
Speed = 72 * 5/18= 
<gadget id="calculator">72 * 5/18</gadget>
<output>20</output>
20 m/sec   Total distance covered= 110 + 136= 
<gadget id="calculator">110 + 136</gadget>
<output>246</output>
246 m.   Required time= 246/20= 
<gadget id="calculator">246/20</gadget>
<output>123/10 = around 12.3</output>
12.3 sec.   Answer: 12.3 sec
<result>B</result>
How long does a train 110 m long running at the speed of 72 km/hr takes to cross a bridge 136 m length?