How do you solve... Two cars are 400 mi apart. Both start at the same time and travel toward one another. They meet 4 hr later. If the rate of one car is 20 mph faster than the other, what is the rate of each car?

Question

ganeshie8 · Answer

say, the speed of slow car = x
then, speed of fast car = x+20

ganeshie8 · Answer

in 4 hours, they both combinedly travelled 400mi

ganeshie8 · Answer

use below formula :- 
distance = speed * time

ganeshie8 · Answer

400 = (x+x+20)*4

anonymous · Answer

40?

ganeshie8 · Answer

yup, speed of slow car, x = 40
speed of fast car = x+20 = 40+20 = 60

anonymous · Answer

Thank you! :)

ganeshie8 · Answer

np :)

ganeshie8 · Answer

If it helps, u may think like this :- we have added speeds x+x+20, cuz speeds are helping each other - to quickly meet each other