How long does a train 140 m long running at the speed of 72 km/hr takes to cross a bridge 132 m length?	Choose the correct option:
A) 13.6 sec B) 12.1 sec C) 17.9 sec D) 16.8 sec E) 14.9 sec
Speed = 72 * 5/18= 
<gadget id="calculator">72 * 5/18</gadget>
<output>20</output>
20 m/sec   Total distance covered= 140 + 132= 
<gadget id="calculator">140 + 132</gadget>
<output>272</output>
272 m.   Required time= 272/20= 
<gadget id="calculator">272/20</gadget>
<output>68/5 = around 13.6</output>
13.6 sec.   13.6 secnswer: 13.6 sec
<result>A</result>
How long does a train 140 m long running at the speed of 72 km/hr takes to cross a bridge 132 m length?