Two identical trains AA and BB running in opposite direction at same speed tale 2 min to cross each other completely. The number of bogies of AA are increased from 12 to 16. How much more time would they now require to cross each other?  Pick one
A) 40 Sec B) 50 sec C) 60 sec D) 20 sec E) 25 sec
Total initial bogies is 12+12=2412+12=24   Additional bogies =16âˆ’12=4   24 bogies is   12+12= 
<gadget id="calculator">  12+12</gadget>
<output>24</output>
24   additional bogies= 16 - 12= 
<gadget id="calculator">16 - 12</gadget>
<output>4</output>
4   24 bogies take 2 min    2*60/24 *4= 
<gadget id="calculator"> 2*60/24 *4</gadget>
<output>20</output>
20 sec   ANSWER 20 sec
<result>D</result>
Two identical trains AA and BB running in opposite direction at same speed tale 2 min to cross each other completely. The number of bogies of AA are increased from 12 to 16. How much more time would they now require to cross each other?