A) \[5\sqrt{\frac{2}{3}}sec\]
B) \[4\text{ }sec\]
C) \[\text{2 }sec\]
D) \[\text{6 }sec\]
Correct Answer: B
Solution :
Relative speed of each train with respect to each other be, \[v=10+15=25\text{ }m/s\] Here distance covered by each train = sum of their \[lengths=50+50=100\text{ }m\] \[\therefore \]Required time = \[\frac{100}{25}=4\text{ sec}\text{.}\]
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