Question

car P travels due East along a straight highway at a constant speed of 30m/s. at 9:00am , P passes Exit 17. At precisely the same moment, car Q passes Exit 16, traveling due West as constant 26m/s. Slightly later, car P and car Q pass the same point. knowing the ecits are exactly 7km apart, how many mintues past 9:00am do the cars pass each other

Answer 1

It helps to know that Exit 16 is east of Exit 17.

Since the two cars travel 7km in t seconds,

30t + 26t = 7000
t = 125 sec

That would be 2'5"