book Maths Puzzle Numerical Ability

3/4 n=16

2/5 n=30

-7/15 =21/10

n.5/16=15/14

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check my work please:
4x^2+8x=0
4x(x+2)=0
4x=0 or (x+2)=0
4x=0 or x=-2 Charles and Paul enter the Center Point - Comfort Hill Country Run. Charles runs at 8 mi/h and Paul at 6 mi/h. If they start together, how long before Charles is 1/4 mi ahead of Paul?