A plane flying from City A to City B travels x miles per hour for a total of 4.5 hours. The plane takes the same route on the return trip, traveling 25 miles per hour faster for a total of 4 hours. What is the total distance that the plane travels?

1800 miles

Step-by-step explanation:

Distance = rate X time.   D=R x T

d=x(4.5)

d=4.5x.      (First trip)

D=(x+25)(4)

D= 4x + 100.  (Return trip)

Total distance

4.5x = 4x +100

X = 200

4.5(200) = 4(200) + 100

1800

9 sandwiches per hour

step-by-step explanation:

when we have a rate, we want a 1 in the denominator

27/3 = 9

27 sandwiches/ 3 hours = 9 sandwiches/hour