Question 773263
The speed of the boat in still water is 7 mph (given)


The speed of the river is 3 mph (given)


The speed of the boat when it goes upstream (against the current) is 7 - 3 = 4 mph


Now move onto the distance = rate x time equation, plug in d = 2 (given distance of 2 miles) and r = 4 (the speed of the boat when it goes upstream). Then solve for t.


d = rt


2 = 4*t


2/4 = t


1/2 = t


t = 1/2


So it will take 1/2 hour or 30 minutes travel 2 miles upstream.