Question 470664
van x miles per hour
car x+15 miles per hour
time=distance/rate
{{{126/(x+15)=99/x}}}cross multiply
{{{126x=99(x+15)}}} 
{{{126x=99x+1485}}} 
{{{27x=1485}}} divide both sides by 27
{{{x=55}}} so vans speed is 55 mph
then car's speed is 55+15=70 mph