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

What kind of prperty is 1x4=4? Could someone out there help me solve this problem?

A tree casts a shodow that measures 5 m. At the same time, a meter stick casts a shodow that is 0.4 m long. How tall is the tree?

Thank you,
Sher