Zeeshan I. answered • 04/10/19

High school/college level math and physics tutor

The distance from Maria's home to school is d.

The distance covered by Maria when she drove to school and then back home is then D = d + d = 2d

Total time taken by Maria to cover this distance is t = 20 minutes + 24 minutes = 44 minutes

Average speed is given as

v = D/t

v = (2d)/(44 minutes)

v = d/22 units/minutes

Therefore, Maria's average speed is d/22 units/min.