Question 1007208
Call the still water's rate, r.
Call the current's rate, c.
In general, speed is found by dividing distance by time...
So we have two cases...
r - c = 910/14 = 65
r + c = 525/7 = 75
Now add the equations and get
2r = 140
r = 70 feet per minute in still water
which means the current must be 
c = 5 feet per minute