An airplane took four hours to fly 1,500 miles. How many hours will it take the airplane to fly 2,100 miles if it flies at the same speed?

5.6

Step-by-step explanation:

mph = m/h

mph = 1,500/4

mph = 375

375 = 2,100 / h

375h = 2,100

h = 2,100/375

h = 5.6

5.6 hours

Step-by-step explanation:

Divide 1500 by 4. This tells you the plane is going 375 miles per hour.

Now divide 2100 by 375. This tell you the plane will take 5.6 hours to travel 2100 miles.