How long does a train 110 m long running at the speed of 72 km/hr takes to cross a bridge 132 m length?
Pick
A) 11  B) 12.1  C) 13  D) 14  E) 15
Speed = 72 * 5/18= 
<gadget id="calculator">72 * 5/18</gadget>
<output>20</output>
20 m/sec   Total distance covered= 110 + 132= 
<gadget id="calculator">110 + 132</gadget>
<output>242</output>
242 m.   Required time= 242/20= 
<gadget id="calculator">242/20</gadget>
<output>121/10 = around 12.1</output>
12.1 sec.   Answer: Option 12.1
<result>B</result>
How long does a train 110 m long running at the speed of 72 km/hr takes to cross a bridge 132 m length?