book Maths Puzzle Numerical Ability

two trains left a station @ the same time. One traveled north at one speed and the other traveled south @ twice the speed. After 4 hours, the trains were 600 miles apart. How fast

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A train leaves Dallas at 1:00pm and travels to Galveston at a rate of 50 mph. A second train from Victoria travels at a rate of 75 mph and a third train leaves Houston at 4:30 pm. Factoring is what i'm doing here.... 1. 15x^2+31=10
i tried another source and it came up with 15x^2+41x amd thats not the answer i'm looking for. i need it to look like this ki