The train travels at a speed of 20 m / s, and another train is moving towards it along the next track at a speed

| April 27, 2021 | education

The train travels at a speed of 20 m / s, and another train is moving towards it along the next track at a speed of 36 km / h. How long will the trains pass each other if the length of the first train is 900 m, and the second is 600 m?

V1 = 20 m / s.

V2 = 36 km / h = 10 m / s.

S1 = 900 m.

S2 = 600 m.

t -?

The travel time of the trains will start when the first cars meet, and ends when the last cars meet.

Any point of the carriage covers the distance S = S1 + S2.

Since the trains travel towards each other, the speed of movement of one train relative to the other V will be the sum: V = V1 + V2.

The travel time of trains t is found by the formula: t = S / V = (S1 + S2) / (V 1 + V2).

t = (900 m + 600 m) / (20 m / s + 10 m / s) = 50 s.

Answer: the travel time of trains is t = 50 s.



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