Two trains left points A and B simultaneously in the same direction. The speed of the first is 80

| January 18, 2021 | education

Two trains left points A and B simultaneously in the same direction. The speed of the first is 80 km / h, and the speed of the second is 30 km / h more. At what distance are points A and B from each other, if the trains met in 4 hours?

The speed of the second train, by condition, is 30 km / h more than the speed of the first, that is, equal to:

80 + 30 = 110 (km / h) – the speed of the second train.

Trains left in one direction, that is, one train is catching up to another.

The speed of their convergence is equal to:

110 – 80 = 30 (km / h) – the speed of the convergence of trains.

In 1 hour, trains reduce the distance between each other by 30 km, which means in 4 hours they have reduced it by:

4 * 30 = 120 (km) – distance between points.

Answer: The distance between the two points is 120 km.



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