a boat takes 2 hours to travel 15 miles upriver against the current. if the rate of the boat in still water is 12 miles per hour. what is the rate of the current?

7 or 8 miles per hour

Step-by-step explanation:

2.1429 or 2 and 1/7

Step-by-step explanation:

Time = time

12/(15+c)=9/(15-c)

12(15-c)=9(15+c)

12*15-12c =9*15+9c

21c=3*15

c=3*15/21

c=45/21=2.1429..(speed of the current)

Downstream info;

distance=12miles;rate=15+c mph; time=d/r =12/(15+c)hrs.

Upstream info;

distance=9miles;rate=15-c mph;time=d/r=9/(15-c)hrs.

I hope it's helpful!

constant of proportionality = 3 and the equation is c = 3p.

step-by-step explanation:

c = kp   where c = amount of caffeine in mg., p = oz of pepsi and k is the constant of proportionality.

substituting the values given:

24 = 8k

k = 3.

the same value of k will be obtained if we substitute the other given values.