SOLUTION: Jennifer and her her brother Michael enjoy racing each other. One day, Michael challenges his sister to a race. Michael said set off on his bike at a constant speed of 15 km/h. 2

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Question 1144280: Jennifer and her her brother Michael enjoy racing each other. One day, Michael challenges his sister to a race. Michael said set off on his bike at a constant speed of 15 km/h. 20 minutes later, Jennifer sits off in pursuit. What is the minimum speed that Jennifer must travel out in order to catch Michael 30 minutes after she sets off?
Answer by josgarithmetic(39615) About Me  (Show Source):
You can put this solution on YOUR website!
               SPEED        TIME(hours)          DISTANCE

Jennifer          r         1%2F2               d

Michael         15          1%2F2%2B1%2F3           d

They each cover the same distance.
r%281%2F2%29=15%281%2F2%2B1%2F3%29