The dog chased the fox, which is 120 m away from it. The fox runs 320 m per minute, and the dog 350 m.

The dog chased the fox, which is 120 m away from it. The fox runs 320 m per minute, and the dog 350 m. How many meters will the distance between the fox and the dog decrease in a minute?

we know how much a dog runs in a minute more than a fox 350 m – 320 m = 30 m
looking for the distance between the dog and the fox in a minute after the start of the race 120 m – 30 m = 90 m
we find the distance between the dog and the fox 2 minutes after the start of the race 90 m – 30 m = 60 m
we are looking for how many meters the distance between the fox and the dog will decrease in a minute 120 m: 30 m = 4 min
answer 4 minutes