Train crosses a platform or tunnel: distance is train plus platform length

This type of question, asked 2 times: 8 Aug 2022 Tier II, 7 Mar 2023 Tier II. All 2 questions below, oldest first.

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Question 1
8 Aug 2022 Tier II
85 $Length of a train is 330 metres and it is moving at the speed of 72 km/hr. In how much time will it takes cross a platform of length 710 metres?$
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Question 2
7 Mar 2023 Tier II
12 $A goods train 350 m long passes through a tunnel of length 1250 m in 80 seconds. What is the speed of the train?$
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