A kitten and a puppy noticed each other and started to run in opposite directions. How far from each other will they be in 15 seconds, if the puppy runs with the speed of 6 meters per second, and the kitten runs 2/3 as fast as the puppy?

First, we can find that the kitten runs 4 meters per second because 2/3 of 6 is 4

Now we can find how far the puppy will go in 15 seconds

If he goes 6 meters in one second, we do 6*15 to get 90 meters

Now we can find how far the kitten will run

If he goes 4 meters in one second, we do 4*15 to get 60 meters

So to find the distance between them we do 60+90 to get 150 meters