The boat covered 72 km along the river and came back which way took him more time and how much

| September 11, 2021 | education

The boat covered 72 km along the river and came back which way took him more time and how much if the boat’s own speed is 21 km / h, the speed of the river is 3 km / h.

1) What is the speed of the boat along the river? It is necessary to add the speed of the river to the boat’s own speed. 21 + 3 = 24 (km / h)
2) What is the speed of the boat upstream of the river? It is necessary to subtract the speed of the river from the boat’s own speed. 21 – 3 = 18 (km / h)
3) How long will the boat take to move along the river? To find the time, the distance traveled must be divided by the speed. 72: 24 = 3 (h)
4) How long will the boat take to move upstream of the river? 72: 18 = 4 (h)
5) Which path took him more time and by how much? 4 h> 3 h 4 – 3 = 1 (h)
Answer. The boat spent 1 hour more on the movement against the stream of the river.



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