In his motorboat, Bill travels upstream at top speed to his favorite fishing spot, a distance of

Question:

In his motorboat, Bill travels upstream at top speed to his favorite fishing spot, a distance of 36 mi, in 2 hr. Returning, he finds that the trip downstream, still at top speed, takes only 1.5 hr. Find the rate of Bill’s boat and the rate of the current. Let x = the rate of the boat and y = the rate of the current.