Two cars simultaneously started traveling towards each other from two cities, which are 400 miles apart. car 1 travels 20mph faster than car 2, and they met in 4 hours. what are the speeds of the cars?

The first car travels at 60 mph and the second at 40 mph.

Step-by-step explanation:

Let's represent the speed of the first car as s1 and that of the second car as s1.  Then s1 = s2 + 20 reflects the fact that the speed of the first car is 20 mph faster than that of the second car.

The total distance traveled is 400 miles.  Since distance = rate times time,

time = distance / rate.

First car:  (s1*t) is the distance traveled;

Second car:  (s2*t) is the distance traveled.

Adding these two distances together results in 400 miles:

s1*t + s2*t = 400 miles, or

t(s1 + s2) = 400 miles.  Let's eliminate s1 by substituting s2+ 20 for it:

t(s2 + 20 + s2) = 400 miles.  But we know t:  the cars both travel 4 hours.

Thus,

(4 hr)(2s2 + 20) = 400 miles, or

(after dividing both sides by 4 hr)

(2s2 + 20) = 100 miles/hr

Subtracting 20 from both sides:

2s2 = 80, so that s2 = 40 mph.

If s2 = 40 mph, then s1 = s2 + 20 = 60 mph

The first car travels at 60 mph and the second at 40 mph.

step-by-step explanation:

sry but any answer choices

answer:

a=9

step-by-step explanation: lmk if you need a explanation