exam Maths Puzzle Numerical Ability

Word Problem:

If John cleans a house in 8 hours and Julie cleans a similar house in 6 hours, how long should it take them to clean another similar house working together?

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exam Other Question

the length of a rectangle is 7 more than the width. the perimeter is 34 meters.

what is the width and length in meters and what is the area in square meters?

please help me please.... I need to solve for X. The problem is 2x^2+24=x^2 i then moved the x^2 so that the problem read x^2+24=0 i have to factor it out. I also have to subtract X by five. X is a distance so it cannot be a negative number X must be greater than five.