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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