book Maths Puzzle Numerical Ability

If a plane flies eastward for four hours with a 60 mph tailwind and returns in five hours, what was the total distance traveled?

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book Other Question

how do you do variables .
Ex.

x=4, y=12
factor the following:

4x2 - 39x + 27

the 4x is squared

I am not sure if this is factorable or not