/sci/ - Science & Math

Race: vroom
Gender: vroom
Country: screeeeek
Age: vroom
IQ if taken: beep beep
Major: vrooooooom

Hey /sci/, why is Hydrogen much more efficient for cars than gasoline? I want to see your take on it.

no, they don't exist, but they're very useful.

Ok /sci/ I'm hitting a mental block here, and I need some help with this physics question.
>Car P travels due east along a straight highway at a constant speed of 30m/s. at 9am P passes exit 17. At precisely the same moment car Q passes exit 16, traveling due west at a constant 26m/s. Slightly later car P and car Q pass the same point. Knowing the exits are exactly 7km apart how many minutes past 9am do the cars pass each other?

So they are both moving at a constant speed, so I know acceleration = 0. I know The velocity of each (30m/s, 26m/s) and I know the distance (7km) how would I set up this problem? I'm not sure what equation to use. I have made two distances, d1 and d2 (d2=7km-d1) but I still can't figure out how to set up this problem. Help would be greatly appreciated.