Question
Paul arrived at the computer room at 8.50 a.m.. He did his first activity for 55 min and spent the rest of the time on the second activity. He left the computer room at 10.20 a.m.. For how long did he spent working on the second activity in the computer room?
4 m

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Paul arrived at the computer room at 8.50 a.m.. He did his first activity for 55 min and spent the rest of the time on the second activity. He left the computer room at 10.20 a.m.. For how long did he spent working on the second activity in the computer room?