David and Terri drove a small motorboat down a river with the current. The rate the boat traveled in still water was r miles per hour, and the current's average speed was c miles per hour. It took them 1.5 hours to travel 4 miles downstream. Which of the following equations can be used to represent this information?

Question

Mathematics

Averie Wallace

29 December, 08:52

David and Terri drove a small motorboat down a river with the current. The rate the boat traveled in still water was r miles per hour, and the current's average speed was c miles per hour. It took them 1.5 hours to travel 4 miles downstream. Which of the following equations can be used to represent this information?

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Answers (1)

Know the Answer?

Kamari Stein · Answer 1

Speed of boat r mi/hr

speed of currect c mi/hr

speed downstream (c+r) mi/hr

but

distance = 4miles

time=1.5 hours

thus

speed=distance/time

hence:

4/1.5 = (c+r)

thus

4=1.5c+1.5r

hence the answer is:

4=1.5c+1.5r