Answer
2.14 hours walking, .86 hours jogging
Work Step by Step
15 miles traveled, 3 hours
4 mph walking
7.5 mph jogging
$4x+7.5(3-x)=15$
$4x+22.5-7.5x=15$
$22.5-3.5x=15$
$22.5=15+3.5x$
$7.5=3.5x$
$7.5/3.5=3.5x/3.5$
$x=2.14$
$3-2.14=.86$
