Question 433043
The speed in still water = 6 kph
Let c = the speed of the current
The speed of the canoeist upstream   = 6 - c
The speed of the canoeist downstream = 6 + c
The time to paddle 1 km upstream = the time to paddle 1.5 km downstream
Since time = distance/speed, we can write the following:
1/(6-c) = 1.5/(6+c)
Solve for c:
6 + c = 9 - 1.5c -> 2.5c = 3 -> c = 1.2 kph