Question 964169
Let the speed of the boat be x
Let the speed of the current be y.
When it travels upstream
x+y=137.5/2.5
x+y=55........equation 1
When it travels downstream
x-y=137.5/5.5
x-y=25........equation 2
Adding 1 and 2 we get,
2x=55+25
2x=80
x=40
y=15
The speed of the boat is 40 miles/hr.
The speed of the current is 15 miles/hr.