Same distance upstream and downstream in given times: ratio of boat speed to stream speed

The same question, asked 2 times: 25 Jul 2023 S3*, 17 Sep 2024 S2. Every wording below, oldest first.

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Question 1
25 Jul 2023 S3
65 $A boat running upstream takes 10 hours to cover a certain distance, while it takes 7 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and that of the water current, respectively?$
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Question 2
17 Sep 2024 S2
62 $A motorboat takes 18 hours to go downstream, and it takes 36 hours to return the same distance. Find the ratio of the speed of the boat in still water to the speed of the stream.$
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Question 1