Train crosses a pole, platform or bridge: length, speed or time

This type of question, asked 4 times: CDS 1 2018, CDS 2 2018, CDS 2 2020, CDS 1 2021. All 4 questions below, oldest first.

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Question 1
CDS 1 2018
27 $A train moving with a speed of 60 km per hour crosses an electric pole in 30 seconds. What is the length of the train in metres?$
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Question 2
CDS 2 2018
28 $A train 100 m long passes a platform 100 m long in 10 seconds. The speed of the train is$
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Question 3
CDS 2 2020
15 $A train of length 110 m is moving at a uniform speed of 132 km/hr. The time required to cross a bridge of length 165 m is$
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Question 4
CDS 1 2021
29 $A train 200 m long passes a platform 100 m long in 10 seconds. What is the speed of the train?$
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Question 1