exam Maths Puzzle Numerical Ability

At school the lockers in one hallway are numbered from 1-25. One morning the first student to enter opened every locker. The second student to enter closed every even numbered lock

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Please help i can not for the life of me, figure this problem out.

Graph the line described: Through (-2,-3);m = 5/4 joe and jenifer are going to wash windows. working alone, it would take jenifer 4 hours to was the windows. it would take joe 3 hours to wash the windows by himself. how long will it take then to wash the windows working together?