Question 352177

Rate*Time=Distance
{{{70*t=D[a]}}}
{{{R[b]*t=D[b]}}}
.
.
.
When {{{t=2.5}}}hrs,
{{{D[a]=175}}} miles
{{{D[b]=175-50=125}}} miles
From above,
{{{R[b]*2.5=125}}}
{{{highlight(R[b]=50)}}} mph