Question 342681
Rate*Time=Distance
.
.
.
{{{R[a]*t=D[a]}}}
{{{10*t=D[a]}}}
.
.
.
{{{R[b]*t=D[b]}}}
{{{15*t=D[b]}}}
.
.
.
{{{D[a]+D[b]=100}}}
{{{10*t+15*t=100}}}
{{{25t=100}}}
{{{highlight(t=4)}}} hrs
.
.
.
{{{D[a]=10*t}}}
{{{D[a]=10(4)}}}
{{{highlight(D[a]=40)}}} miles