Jack and Jill are going swimming at a pool that is one mile from their house. they leave home simultaneously. Jill rides her bicycle to the pool at a constant speed of 10 miles per hour. Jack walks to the pool at a constant speed of 4 miles per hour. How many minutes before Jack does Jill arrive?

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Answers

2016-07-13T19:09:46+08:00
Distance = Rate * Time
Distance/Rate = Time

Time it would take for each:

Jack = 1/4 hour = 15 minutes
Jill = 1/10 hour = 6 minutes

15 - 6 = 9 minutes
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