Speeds in a ratio over the same distance: times in the inverse ratio

This type of question, asked 2 times: CDS 2 2016, CDS 1 2024. All 2 questions below, oldest first.

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Question 1
CDS 2 2016
39 $The speeds of three cars are in the ratio 2 : 3 : 4. What is the ratio between the times taken by these cars to travel the same distance ?$
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Question 2
CDS 1 2024
2 $The speeds of four cars are 2u, 3u, 4u and xu and the time taken by them to cover the same distance is xt, 4t, 3t and 2t respectively, where x, u, t are real numbers. What is the value of x ?$
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Question 1