Your mother is sure that you were driving too fast because she knows when you arrived and the direction you came from. how long it took you to get home and how far you traveled. what time you left and how long it took you to get home. the direction you were driving and how far you traveled.

Your mother is sure that you were driving too fast because
she knows how long it took you to get home and how far
you traveled.

If she gets her calculator out of her sewing box and divides
the distance you covered by the time it took you to cover the
distance, the answer she gets will be your average speed.

Divide 108.2 x 10^6 into 1.5 x 10 and the result will be in au (astronomical units)