Question 1069529
{{{L=B+2}}}
{{{B*t+L*t=D}}}
.
.
.
{{{B*2.5+L*2.5=85}}}
{{{2.5(B+L)=85}}}
Substituting,
{{{2.5(B+B+2)=85}}}
{{{2B+2=34}}}
{{{2B=32}}}
{{{B=16}}}{{{mph}}}
So,
{{{L=16+2}}}
{{{L=18}}}{{{mph}}}