Question
Liam arrived at the computer room at 10.30 a.m.. He did his first activity for 50 min and spent the rest of the time on the second activity. He left the computer room at 11.50 a.m.. For how long did he spent working on the second activity in the computer room?
4 m

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Liam arrived at the computer room at 10.30 a.m.. He did his first activity for 50 min and spent the rest of the time on the second activity. He left the computer room at 11.50 a.m.. For how long did he spent working on the second activity in the computer room?