A bus with 12 basketball players broke down in a town 20 miles from its destination. The coach’s car was available but could carry only 4 players at a time. Also, it could travel only 20 miles per hour because of the traffic. The players said they could walk at 4 miles per hour when they were not riding. Suppose the coach took 4 of them part way, came back for 4 more and took them part way, and then came back for the last 4. How could they all get to their scheduled basketball game at the same time?

Question

A bus with 12 basketball players broke down in a town 20 miles from its destination.  The coach’s car was available but could carry only 4 players at a time.  Also, it could travel only 20 miles per hour because of the traffic.  The players said they could walk at 4 miles per hour when they were not riding.  Suppose the coach took 4 of them part way, came back for 4 more and took them part way, and then came back for the last 4.  How could they all get to their scheduled basketball game at the same time?