Train crosses a platform or a standing train: time

This type of question, asked 2 times: 14 Jul 2023 S1, 26 Jul 2023 S3. All 2 questions below, oldest first.

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Question 1
14 Jul 2023 S1
60 $A train 900 m long is running at 108 km/h. How long will it take to clear a 900 m long platform completely?$
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Question 2
26 Jul 2023 S3
59 $Rajdhani Express train of length 108 m is running at the speed of 128 km/h. Another train of length 148 m is standing at the station. In what time will the Rajdhani Express cross the other train?$
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