exam Maths Puzzle Numerical Ability

Martina leaves home at 9 A.M., bicycling at a rate of 24 mi/h. Two hours later, John leaves, driving at the rate of 48 mi/h. At what time will John catch up with Martina?

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I could use some help with a few problems please!

1.) If P(x)=3(x+1)^3(x-7)(5x-2), then which of the following is a zero of the polynominal? a. 5/2 b. 0 c. 1 d. 3 e. 7
Add or subtract as indicated. Express your result in simplest form
4y/ y^2 + 6y + 5 + 2y/ y^2 - 1