Question
Oliver arrived at the computer room at 10.40 a.m.. He did his first activity for 40 min and spent the rest of the time on the second activity. He left the computer room at 1.50 p.m.. For how long did he spent working on the second activity in the computer room?
4 m

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Oliver arrived at the computer room at 10.40 a.m.. He did his first activity for 40 min and spent the rest of the time on the second activity. He left the computer room at 1.50 p.m.. For how long did he spent working on the second activity in the computer room?