exam Maths Puzzle Numerical Ability

Working together Linda and Jim can clean the windows of their house in 3 hours and 36 minutes. Linda can clean all the windows by herself in 7 hours. How long will it take Jim to clean the windows by himself?

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exam Other Question

First determine the deflection based solely on the distributed load.
delta = 5wL^4/384 EI
= (5)(2kip/ft)(24^4ft)(12in/ft)^3/(384)(29,000ksi)(1330in^4)
= .387 factor the polynomial completely,clearly show GCF

4x^2-16

I went another step and I am not sure weather to factor again after this:

(2x - 4)(2x + 4)