exam Maths Puzzle Numerical Ability

linda and dave leave simultaneoously from the same starting point biking in opposite durections. Linda bikes at 7 miles per hour and Dave bikes at 8 miles per hour. How long will it be until they are 25 miles apart from each other?

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please help my problem solving. (a 165 rope is cut into 3 pieces, the second piece is twice as long as the first. the third is 4 times as long as the second. how long is each piece of rope?) thank you simplify and state the excluded values
(x^2+x-12)/(60-5x-5x^2)