It took fran 1.8 hours to drive to her mother's house on saturday morning. on her return trip on sunday night, traffic was heavier, so the trip took her 2 hours. her average speed on sunday was 6 mph slower than on saturday. what was her average speed on sunday?

  54 mph

Step-by-step explanation:

Let s represent the slower speed. The product of speed and time is distance, which did not change between the two trips. So, we have ...

  1.8(s +6) = 2(s)

  10.8 = 0.2s . . . . eliminate parentheses, subtract 1.8s

  54 = s . . . . . . . . divide by 0.2

Fran's average speed on Sunday was 54 miles per hour.

Her trip was 108 miles long.

1. 3

2. 4

3. 1

hope this ! have a great day.

-wfz

the anwser is d) 75°

step-by-step explanation: