Question

Two trains, each 50 m long are travelling in opposite direction with velocity 10 m/s and 15 m/. The time
of crossing is ______
(a) 2s (b) 4s (c)2.3s (d)4.3 s

Answer 1

Given :

• Length of the two trains = 50m
• Velocity of 1st train, v₁ = 10m/s
• Velocity of 2nd train, v₂ = 15m/s

To find :

• The time of crossing each other?

Solution :

We know that~

• Time = Total distance/Relative velocity

where,

• Total distance = (50 + 50) = 100m
• Relative velocity = (v₁ + v₂) = (10 + 15) = 25m/s

Substituting values~

⠀⠀⠀⟶⠀Time = 100/25

⠀⠀⠀⟶⠀Time = 4s

•°• The time crossing each other is 4 seconds.

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