You are in a boat. When you are going along the river you are on, then in 5 hours you go 60 kilometres. If you go against the river you are on, then in 10 hours you go 60 kilometres.

2.5 kph

You need to find the distance and divide by 2 since it goes from pushing you to pulling you back. 10-5=5

5/2=2.5

If you add 2.5 to 5 so the river is stopped so it isn't pushing you and subtract 2.5 from 10 since the river stopped pulling you get 7.5 for both so it means the base speed is 7.5 so that is your base speed without the river.

Step-by-step explanation:

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answer: what do you mean

true

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