Question 317840
let speed of boat be x mph
speed of current be y mph
..
speed * time = distance
4(x-y)=192
x-y=48
..
2(x+y)=192
x+y=96
add both the equations
x-y+x+y=96+48
2x=144
x=72 mph. speed of boat
..
x-y=48
72-y=48
y=72-48
24 mph speed of current