James can row 14km downstream in a river in 2 hours He takes

James can row 14km downstream in a river in 2 hours. He takes 7 hours to go back. Find the speed of the current and the speed of James in still water. Use two variables.

Solution

2(x+y):14
7(x-y):14
2x+2y:14
7x-7y:14
14x+14y:98
14x-14y:28
28x:126
x:4.5
2(4.5+y):14
9+y=14
y=5