Suppose that this person drives at r mph going to the mountains, and gets there in 12 hours. Returning, this person drives at (r+20) mph and gets home in 8 hours. We don't know the distance yet, but can solve for the initial speed, r, by setting
d = 12r = (r+20)(8). Solving for r, r=40 mph (going) and (40+20)mph = 60 mph (returning. Since d=12 r, d = (12 hrs)(40 mph) = 480 miles (answer).
Answer:
I wish I knew this maybe use the brainy scanner it could help you or google.
Answer:
20
Step-by-step explanation:
4*5 = 20%
Cross multiplication is applied here.
18* is 18 above 0. -12* is 12 below 0.
So add: 18+12=X. The difference in temperature is X :)
