Frequently asked question, just using different values given.
rate time distance
WITH r+w 6 4452
AGAINST r-w 6 3312
All in symbols:
rate time distance
WITH r+w t c
AGAINST r-w t b
------this will allow for easy use of the Elimination Method.
Summing the corresponding members,
Subtracting the corresponding members,
Now you can just substitute the given values and evaluate.