book Maths Puzzle Numerical Ability

Two trains leave Chicago, one traveling East at 30 miles per hour, and one traveling west at 40 miles per hour. When will the trains be 210 miles apart?
(We are supposed to be using the formula d=rt.)

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Hi There!

I really need help understanding Factoring with a Zero Product. Could someone please explain this problem to me?

-2x^2 -2x + 24=0

Thanks to all Can you help me answer this question? The question is b=17/8 which is a fraction times h=90 how can I find the area of that kind of paralellogram.