Question

Roberto runs 25 miles. His average speed is 7.4 miles per hour. He takes a break after 13.9miles.How many more hours does he run? Show your work.
​

Answer 1

Answer:

1.5 hours

Step-by-step explanation:

Number of miles = 25 miles

Average speed = 7.4 miles per hour

Break after 13.9 miles

How many more hours does he run

Speed = distance / time

Total time for 25 miles :

Time = distance / speed

Time = 25 / 7.4

Time = 3.378 hours

Total time to cover 13.9 miles :

Time = 13.9 / 7.4

Time = 3.378 hours

Time = 1.878 hours

Difference = (3.378 - 1.878) hours = 1.5 hours

Hence, he to ran for 1.5 hours after taking a break

Answer 2

The total time required for the 25 miles run is 3.378 hours and he will run for 1.5 hours after the break.

Given information:

Roberto runs 25 miles.

The average speed is 7.4 miles per hour.

He takes a break after 13.9 miles.

Now, speed is defined as the ratio of distance and time.

So, the time taken by him to run first 13.9 miles will be,

$s=\dfrac{d}{t}\\7.4=\dfrac{13.9}{t_1}\\t_1=1.878$

So, he ran for 1.878 hours to cover 13.9 miles.

Now, the total time of the 25 miles run will be,

$T=\dfrac{25}{7.4}\\T=3.378$

So, the total time of the run is 3.378 hours.

After the break, he will run for 3.378-1.878 hours = 1.5 hours.

Therefore, the total time required for the 25 miles run is 3.378 hours and he will run for 1.5 hours after the break.

For more details, refer to the link:

https://brainly.com/question/20498128