Boat upstream and downstream: speed in still water or of the stream

This type of question, asked 2 times: 18 Sep 2025 S1, 26 Sep 2025 S2. All 2 questions below, oldest first.

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Question 1
18 Sep 2025 S1
21 $A boat travels 60 kilometers upstream in 3 hours and covers the same distance of 60 kilometers downstream in 2 hours. What is the speed of the boat in still water?$
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Question 2
26 Sep 2025 S2
11 $A man rows 12 km downstream in 3 hours and 6 km upstream in 2 hours. What is the speed of the stream?$
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