Train overtakes a man moving in the same direction: length, speed or time

This type of question, asked 4 times: CDS 1 2017, CDS 2 2023, CDS 2 2025, CDS 2 2026. All 4 questions below, oldest first.

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Question 1
CDS 1 2017
35 $A 225 m long train is running at a speed of 30 km/hour. How much time does it take to cross a man running at 3 km/hour in the same direction ?$
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Question 2
CDS 2 2023
78 $\frac{75}{8}$
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Question 3
CDS 2 2025
51 $X$
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Question 4
CDS 2 2026
6 $A train completely crossed two persons X and Y moving in the same direction as the train in 8 seconds and 8.1 seconds respectively. X is walking at a uniform speed of 3 km/hr and Y is walking at a uniform speed of 4 km/hr. What is the speed of the train ?$
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Question 1