Question

An airplane flies 810 km in 1.5 hours. How far will the plane fly in 2.2 hours if it maintains the same air speed?

Answer 1

First, you should find the unit rate of the airplane.
( 810/1.5 = 540 )
Second, multiply the unit rate by the amount of time.
( 540 x 2.2 = 1,188 )

1,188 miles

Answer 2

1.5 hours: 810 km
2.2 hours: ?km
The plane will travel: 
2.2 x 810 : 1.5= 1188 km