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Two up-and-down journeys with times: speed of the boat in still water

The same question, asked 2 times: 20 Jul 2023 S1*, 26 Jul 2023 S1. Every wording below, oldest first.

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  1. Question 1

    20 Jul 2023 S1

    71
    A boat can go 60 km downstream and 40 km upstream in 12 hours 30 minutes. It can go 84 km downstream and 63 km upstream in 18 hours 54 minutes. What is the speed (in km/h, to the nearest integer) of the boat in still water?

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  2. Question 2

    26 Jul 2023 S1

    58
    A boat goes 20 km upstream and 44 km downstream in 8 hours. In 5 hours, it goes 15 km upstream and 22 km downstream. Determine the speed of the boat in still water.

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