I need help on either one of these

Find the zeros of each function. f(x) = 6x^2 - 7x - 20

Hey free points ! people i have a few math questions on my profile consider looking at them i have to get done in 30 mins!

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?