Question 1163452
How far can a man walk into the country at the rate of 4mph if he rides back at the rate of 20 mph and his total time is 8 hours?
--------------
His average speed is 2*4*20/(4+20) = 160/24 = 20/3 mi/hr
-------------
The round trip distance = 8*(20/3)
Each way = 80/3 miles