Problems on Trains - Arithmetic Aptitude Questions and Answers

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Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction?

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Answer : Option B

Explanation :

Speed of the first train = $(\frac { 120 } { 10} ) m/sec =12m/sec$

Speed of the second train = $(\frac { 120 } { 15} ) m/sec = 8m/sec$

Relative speed = (12 + 8) = 20 m/sec.

Required time= $\left (\frac {( 120+120) } { 20 } \right) sec = 12 sec$

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