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Question:

Rachel ran 1/2 mile in 4 minutes. At this rate, how many miles can she run in 15 minutes?

A 1(7/8)
Explaination

The proportion (1/2) mile/4minutes = x miles /15minutes models this situation. Cross multiply 1/2 * 15 =4x, so 15/2 =4x and x = 15/2 * 1/4 =15/8=1(7/8) miles.