Boat Water

What is the sped of the boat in still water?

A boat travels 2km upstream and 2km back. the time for the round trip is 10 hours. The speed of the stream is 2km/hr. what is the speed of the boat in still water?

Speed of the boat—x:
2/(x + 2) + 2/(x – 2) = 10
1/(x [...]