The forester left the forest and headed towards the house at a speed of 5 km / h. A dog ran out of the house at a speed of 20 km / h. She ran to the forester and turned back, then again to the forester and again back. What distance will the dog run until the forester comes home, if the distance from the forest to the house is 10 km?
1) 10: 5 = 2 (h) – the forester will go
2) 20 ◦ 2 = 40 (km) – the dog will run
Answer: 40 km.
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