The time taken by a boat to cover a certain distance upstream is equal to 4/7 of the time taken by..

Описание к видео The time taken by a boat to cover a certain distance upstream is equal to 4/7 of the time taken by..

The time taken by a boat to cover a certain distance upstream is equal to 4/7 of the time taken by it to cover three times the same distance downstream. The speed of the stream is 7.5 km/h. How many (total) hours will the boat take to go 42 km upstream and 54 km downstream?

4.2

3.5

4

3

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