Question : A train of length 360 m crosses an electric pole in 30 s and crosses another train of the same length travelling in the opposite direction in 15 s. What is the speed of the second train?
Option 1: 12 m/s
Option 2: 36 m/s
Option 3: 24 m/s
Option 4: 60 m/s
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Correct Answer: 36 m/s
Solution : The speed of the first train = $\frac{360}{30}$ = 12 m/s Let the speed of the second train = $x$ m/s The relative speed between the train = $(x+12)$ m/s The total length of the train = 360 + 360 = 720 $\text{Speed}=\frac{\text{Distance}}{{\text{Time}}}$ $⇒\frac{720}{x+12}=15$ $⇒x+12=48$ $⇒x=36$ Hence, the correct answer is 36 m/s.
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