A Motorboat Leaves a Harbor and Travels at an Average

Multiple Choice

A motorboat leaves a harbor and travels at an average speed of 12 mph towards a small island. Two hours later, a cabin cruiser leaves the same harbor at an average speed of 24 mph toward the same island. In how many hours after the cabin cruiser leaves the harbor will it be alongside the motorboat?

A) 1 h
B) 8 h
C) 2 h
D) 7 h
E) 6 h