A river cruise ship travels at 18mph on a still lake. For cruises, it travels up and down a river that has a current of 2mph. It sails between two cities that are 80 miles apart.

Algebra and Trigonometry (6th Edition)
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ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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A river cruise ship travels at 18mph on a still lake. For cruises, it travels up and down a river that has a current of 2mph. It sails between two cities that are 80 miles apart. 

1: How fast does the cruise ship travel when sailing downstream?
2: How long does it take the ship to travel between the two cities when sailing downstream?
3: How fast does the cruise ship traveling when sailing upstream?
4:How long does it take the ship to travel between the two cities when sailing upstream?

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