You can
put this solution on YOUR website!Let

-----------------> faster car

---------------------> slower car
Remember the situation, that

is ahead of

at a certain

that we're looking for. Putting that into equation, we need to add

to

to cover the gap of

:

, cross multiply

, divide both side by 15 to solve "time":

---> time=3 hours & 20mins
After

and

,

will be 50 miles ahead of

. In doubt? Let' see:
DISTANCE OF

AFTER 3 hours & 20 minutes:

DISTANCE OF

AFTER 3 hours & 20 minutes:

Thank you,
Jojo