If mary drove 525miles in 7hours at an average speed of 75 miles per hour how much faster would her average speed need to be to make the trip in 5 hours ( a little speed demon! )

30 miles per hour faster

We are given;

We are supposed to determine how fast the average speed would be if she made the trip in 5 hours.

Therefore, we can determine the speed when she took 5 hours

           = 525 miles ÷ 5 hours

           = 105 hours

Thus, the new speed would be 105 miles per hours

But, initial speed was 75 miles per hour

Therefore, she would travel 30 miles per hour faster to cover the journey in 5 hours.

thats a little if u want the answer just look it up on google thats what i do haha : )