SOLUTION: Bob walked a total of 2.5 miles on a treadmill He walked 2 mikes per hour for one third of the time and 4 miles per hour for two third of the time. What amount of time did he wal

Question 971576: Bob walked a total of 2.5 miles on a treadmill He walked 2 mikes per hour for one third of the time and 4 miles per hour for two third of the time. What amount of time did he walk on treadmill

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = distance Bob walked at mi/hr
= distance he walked at mi/hr
Let = total time he walked on treadmill
---------------------------------------------
Walking at 2 mi/hr:
(1)
Walking at 4 mi/hr
(2)
---------------------------
Substitute (1) into (2)
(2)
(2)
(2)
(2)
(2)
He was on the treadmill for 3/4 hr or 45 min
check:
(1)
(1)
(1) mi
and
(2)
(2)
(2)
(2)
(2) hr
OK

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