Question

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!)

Answer 1

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

• Speed = Distance ÷ time

= 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.