Answer:
350 miles
Step-by-step explanation:
The relationship between time, speed, and distance is ...
time = distance/speed
If we let d represent the distance between towns, we have a total drive time of ...
d/70 + d/50 = 12
50d + 70d = 12(50)(70) . . multiply by 50·70
120d = 120(350) . . . . . . . simplify a bit
d = 350 . . . . . . . . . . . . . . divide by 120
The distance between towns is 350 miles.
