Question
Valen arrived at the computer room at 8.35 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 12.25 p.m.. For how long did he spent working on the second activity in the computer room?
4 m

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Valen arrived at the computer room at 8.35 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 12.25 p.m.. For how long did he spent working on the second activity in the computer room?