Question 39981
Total time = 4.5+3.5=8 hours
EQUATION:
{{{x/60+x/(20-4)=8}}}
{{{x/60+x/16=8}}}
{{{960(x/60)+960(x/16)=960(8)}}}
16x+60x=7680
76x=7680
x=101 (rounded)
Hence, the distance is 101 miles.
Paul.