Tricky word problem #2

Question

Here is a problem I have from my math class that I cannot figure out:

 

From two towns, A and B, two cars left at the same time toward each other-one from town A, and the other from town B. The speed of the first car is 70 mph, and the speed of the second car is 80 mph.

a. If the distance between the between the two towns is 300 miles, how long does it take for the two cars to meet?
b. If the distance between the two towns is 150 miles, how long does it take for the two cars to meet?
c. If the distance between the two towns is 273 miles, how long does it take for the two cars to meet?

 

Thanks for your help in advance!!

Answer 1

(a) 70h + 80h = 300 miles

150h = 300

h = 2 hours

(b) 1 hour

(c) 150h = 273

h = 1.82 hours