Question 22899
Let x = walking rate
2x= jogging rate


D=RT, so {{{T=D/R}}}


Total time = Time walking + Time jogging = 1 hour
{{{D/R + D/R = 1}}}
{{{2/x + 2/(2x)=1}}}


Reduce the fraction above:
{{{2/x + 1/x = 1}}}


Common denominator of x, so add numerators:
{{{3/x=1}}}


So, x = 3 mph walking speed.
2x = 6 mph jogging speed.


It checks since time walking = {{{(2 miles)/(3 mph)}}} = 2/3 hours
Time jogging = {{{(2 miles)/(6 mph)}}} = 1/3 hours 
Total time = 2/3 + 1/3 = 1 hour


R^2 at SCC