Answer:
30 miles per hour faster
Step-by-step explanation:
We are given;
- Distance that Mary drove as 525 miles
- Time she took as 7 hours
- Average speed as 75 miles per hour
We are supposed to determine how fast the average speed would be if she made the trip in 5 hours.
- We know that speed is given by dividing distance by time taken.
- In this case distance remained constant
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.