Ben's boat will take 1½ hours longer to go 12 miles up a river than to return. What is the rate of his boat if the rate of the current is 2 miles an hour?
a. 4 mph
b. 5 mph
c. 6 mph

Respuesta :

Answer: C. 6 mph

I took the test a while back, and I'm sure I had this one correct.