book Maths Puzzle Numerical Ability

Jeff leaves his house on his bicycle at 8:30 A.M. and averages 5 miles per hour. His wife, Joan, leaves at 9:00 A.M. following the same path and averaging 8 miles per hour. At what time will Joan catch up with Jeff?

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book Other Question
Equations with variables
3/2y - y = 4 + 1/2y

Do not know where to begin. I believe I would start by simplifying first portion of problem. Would I subtract 3/2y from 1/1y? Clueless. 1. 37sqrt2x^5-60x^2sqrt50x


2. 44 ^3sqrt135x^5-90x^3sqrt5x^2


3. 13/^3sqrt25x

4. 3/^4sqrt2