Question 823676
let the distance distance downstream be x

upstream speed = 3-1=2 mph

downstream speed = 3+2 = 5 mph

time downstream + time upstream = 3

x/2 +x/5 =3

multiply by 10

5x+2x=30
7x=30

x= 30/7 = 4.3 miles

time down stream = 4.3/5
=0.86 hours
or 52 minutes