Time, Speed & Distance
Aptitude

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Q.

Two identical trains $A$ and $B$ running in opposite direction at same speed tale 2 min to cross each other completely. The number of bogies of $A$ are increased from 12 to 16. How much more time would they now require to cross each other?

 A.

40 sec

 B.

50 sec

 C.

60 sec

 D.

20 sec

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Solution:
Option(D) is correct

Total initial bogies is $12+12 = 24$

Additional bogies $= 16−12 = 4$

24 bogies take 2 minutes.

4 bogies will take: 

\(=\dfrac{2\times 60}{24}\times 4\)

20 sec.


(1) Comment(s)


Anita
 ()

total boggies 24 take 2 min i.e; 120 sec

1 boggie will take 5 sec

therefore 4 boggies will take 5 * 4=20 sec