Question 1155687
A boat travelling upstream goes 84 kilometers in 7 hours. If the return trip takes only 3 hours, what is the speed (in kilometers per hour) of the boat in still water?
--------------
Find the 2 speeds, upstream and downstream.
The boat's speed is the average of the 2.
-----
The speed of the current is the difference between boat speed and either speed, up or down stream.