Thief a given distance ahead, both start together: gap between them after t minutes

The same question, asked 4 times: 17 Jul 2023 S1*, 20 Jul 2023 S3*, 24 Jul 2023 S1*, 11 Sep 2024 S2. Every wording below, oldest first.

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Question 1
17 Jul 2023 S1
57 $A policeman noticed a thief from 300 m. The thief started running and the policeman was chasing him. The thief and the policeman ran at the speeds of 8 km/h and 9 km/h, respectively. What was the distance between them after 3 minutes?$
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Question 2
20 Jul 2023 S3
64 $A thief is noticed by a policeman from a distance of 200 m. The thief starts running as soon as he is noticed, and the policeman chases him simultaneously. The thief and the policeman run at the speeds of 10 km/h and 11 km/h, respectively. What is the distance (in m) between them after 6 min policeman starts chasing?$
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Question 3
24 Jul 2023 S1
60 $A thief is noticed by a policeman from a distance of 500 m. The thief starts running and the policeman chases him. The thief and the policeman run at the rate of 17 km/h and 20 km/h, respectively. What is the distance between them after 8 minutes?$
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Question 4
11 Sep 2024 S2
51 $A thief is noticed by a policeman from a distance of 200 m. The thief starts running and the policeman chases him. The thief and the policeman run at the rate of 10 km/h and 11 km/h, respectively. What is the distance (in metres) between them after 9 minutes?$
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Question 1