exam Maths Puzzle Numerical Ability

Using a new lawn mower, Abby can mow the lawn in 2 hours. Her sister Carla uses an older mower and takes 3 huors to mow the same lawn. How long will it take them if they work together? Please tell me how you answer it. That would be awesome.

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exam Other Question
problem: im opening a comic book store . my expenses add up to 9700 dollars. its $3's per comic book, $1.50 revenue(how many comic books would i have to sell to cover my expenses. hey i need help solving this rational equation.

Here it is:

1/x - 1/6 = 4/3x^2

Thank you!!