A submarine travels 56 miles in 4 hours at this rate how many hours will it take the submarine to travel 700 miles?

A submarine that travels 56 miles in 4 hours averages 16 miles per hour. (The 56 miles divided by 4 hours = 16 miles per hour.) To cover 700 miles at 16 miles per hour will take 700 miles divided by 16 miles per hour = 50 hours.