Two cars are headed straight for each other each at a constant speed of 40 mph. Do the two cars have the same speed?

Oh, isn't that an interesting scenario! Even though the cars are both going 40 mph, they are moving towards each other, so we can say they have a combined speed of 80 mph relative to each other. Each car is still going 40 mph in its own direction, but when you look at them coming towards each other, it's like they're going 80 mph together.