How long does a train 100 m long traveling at 72 kmph takes to cross a tunnel of 1400 m in length?	Answers:
A) 70 sec B) 60sec C) 82 sec D) 75 sec E) 62 sec
75 sec = 1400+100= 
<gadget id="calculator">1400+100</gadget>
<output>1_500</output>
1500 m   S= 72 * 5/18= 
<gadget id="calculator">72 * 5/18</gadget>
<output>20</output>
20   T= 1500 * 1/20= 
<gadget id="calculator">1500 * 1/20</gadget>
<output>75</output>
75 sec   ANSWER:75 sec
<result>D</result>
How long does a train 100 m long traveling at 72 kmph takes to cross a tunnel of 1400 m in length?