# A boat travels210 miles downstream and back. The trip downstream took 10 hours. The trip back took 70 hours. What is the speed of the boat in still water? What is the speed of the current?

##### 1 Answer

Oct 3, 2015

I considered that the trip downstream is

#### Explanation:

Call the speed of the boat

downstream:

upstram:

where I used the fact that speed=distance/time;

from the second equation we have:

and in