Question 1025382
let speed of barge in still water be x mph
and current speed = y mph

upstream distance = 24
time = 3 hours

upstream speed = 24/3 = 8 mph

downstream distance = 24 miles
time = 2 hours
speed = 24/2=12 mph


x+y =12
x-y =8

add the equations

2x = 20
x= 10 

speed of bargein still water  = 10 mph