Question

What about takes four hours to travel 128 km going upstream and return it takes two hours going down stream what is the rate of the boat in Stillwater and what is the rate of a Current

Answer 1

Since the rate = distance/time

Since the distance is 128 km

Since the time of upstream is 4 hours

Then the rate of the boat in the still water is

`\begin{gathered} R_s=(128)/(4) \\ R_s=32km\text{ per hour} \end{gathered}`

Since the boat took 2 hours downstream, then

The rate of the current is

`\begin{gathered} R_c=(128)/(2) \\ R_c=64km\text{ per hour} \end{gathered}`