algebra punchline worksheet

Question

A boat travels 45 mi upstream (against the current) in 5 hours.The boat travels the same distance downstream in 3 hours. What is the rate of the boat in still water? What is the rate of the current?

Answer 1

45=(r-c)5

45=(r+c)3

 

9=r-c

15=r+c

add

24=2r

r=12 mph   rate of the boat

c=3 mph     rate of the current