A traveler left the city on a straight road, and 2 hours after him a horseman set out on the same road. the rider travels at a speed

| August 17, 2021 | education

A traveler left the city on a straight road, and 2 hours after him a horseman set out on the same road. the rider travels at a speed of 20 km / h, the traveler walks at a speed of 5 km / h. How long after the rider leaves the distance between the rider and the traveler will be equal to 5 km?

Let’s find the distance traveled by the traveler in 2 hours.

5 * 2 = 10 km.

Let’s find the speed of rapprochement between the rider and the traveler.

20 – 5 = 15 km / h.

Let us find the time it will take for the rider to reduce the distance between him and the traveler from 10 km to 5 km.

(10 – 5) / 15 = 5/15 = 1/3 hour.

Let’s express the time 1/3 hour in minutes.

60/3 = 20 minutes.

Answer: 20 minutes after the rider leaves, the distance between them will be 5 km.



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