Question 174710
lets call Rate walking{{{r[w]}}}and rate biking{{{r[b]}}}
:
d=rt
:
{{{4=r[b](1/3)}}}............20 min =1/3 hr
:
{{{highlight(r[b]=12)}}}mph
:
so for the bike to travel 3 miles lets find the time
:
3=12t--->t=3/12=1/4 hr
:
so if the total time for biking and walking is 1/2 hr
:
then the time for walking 1 mile is 1/4 hr(1/2-1/4)
:
{{{1=r[w](1/4)}}}
:
{{{highlight(r[w]=4)}}}mph