Answer:
x<-8
Step-by-step explanation:
We need to know the distance
Distance = speed × time
Speed = 60 - 10 = 50 mph
Time = 1 hr
Therefore Distance = 50 × 1 = 50 miles
When you have two fractions equal to each other, you can cross multiply. So, multiply x by 5 and 4 by 15.
5x = 60
Divide both sides by 5.
x = 12.