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There are two trains moving towards each other with a speed 15 m/s and 20 m/s. Their lengths are 124 m and 121 m respectively. How much time would they need to cross each other?

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Detailed Solution

S 1=15 m/s ,S 2= 20 m/s

L 1= 124 m ,L 2= 121 m

T= $\frac{L 1 + L 2}{S 1 - S 2}$ = $\frac{124 + 121}{20 + 15}$ $\to$ $\frac{245}{35}$ =7 SECONDS

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