book Maths Puzzle Numerical Ability

when working alone, Gail can finish her paper route in 6hrs. When Mike substitutes for her, he can complete the job in 9 hrs. If they work together, how long should it take them ?
I dont quite get what does "paper route" mean? what is that?

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book Other Question

Okay, I lied, I have one more:
Could someone please help me?
I really need help to reduce this problem into lowest terms by performing the indicated operation:
5/3a-9 -3/2a + 4/ there are two solutions for the equation {{{bx^2-cx+a^2=0}}} (where a,b,and c are constants, and x is the unknown). They differ by the sign of the square root. Enter the the on wit