Algebra and Trigonometry (6th Edition)
Algebra and Trigonometry (6th Edition)
6th Edition
ISBN: 9780134463216
Author: Robert F. Blitzer
Publisher: PEARSON
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Two boats leave the same dock in Cairo at the same time. One heads north on the Mississippi River while the other heads south. The northbound boat travels three miles per hour. The southbound boat goes nine miles per hour. How many hours will it take them to be 54 miles apart?

I don't need the answer but how to set up the equation.  Thanks!

Expert Solution
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Step 1

Two boat travel two sides. 

The northbound boat travel 3 mile per hour 

The southbound boat travel 9 mile per hour. 

We know Distance = Speed × time 

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