Romeo and Juliet are 40 Miles apart. He is jogging toward her at 4 mph and she is jogging towards him at 6 mph. how many miles will romeo have jogged when they are 10 miles apart?
They need to be 30 miles closer to each other. Their closing speed is 10 mph, so this will take 3 hours. Romeo will have travelled 12 miles in 3 hours (at 4 mph)