A fisherman had to be at an appointment at 10:30. He went fishing at 7:00 and was 20 miles from the boat dock. If the fisherman's boat goes 80 miles per hour,what time will he reach the dock if he left at 9:30 from his current position?

Question

A fisherman had to be at an appointment at 10:30.  He went fishing at 7:00 and was 20 miles from the boat dock.  If the fisherman's boat goes 80 miles per hour,what time will he reach the dock if he left at 9:30 from his current position?

PsyDAG · Answer

20 miles is 1/4 of the 80mph, so it will take him 15 minutes to reach the dock. 20/x = 80/1