Boat in a stream: downstream b + s, upstream b - s

This type of question, asked 2 times: 2 Mar 2023 Tier II, 3 Mar 2023 Tier II. All 2 questions below, oldest first.

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Question 1
2 Mar 2023 Tier II
20 $A man can row 10 km/h in still water. When the river is running at a speed of 4.5 km/h, then it takes him 2 h to row to a place and comes back to the initial point . How far is the place (in km) (rounded off to two decimal places)?$
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Question 2
3 Mar 2023 Tier II
1 $A boat covers 35 km downstream in 2 h and covers the same distance upstream in 7 h. Find the speed (in km/h) of the boat in still water.$
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Question 1