Question

Sarah and Ronald drive on a straight road beginning at the same rest stop. Sarah drives at a velocity of

48
48​ miles per hour. Ronald drives at a velocity of
−
40
−40​ miles per hour. For each question below, simplify your answer completely.

If the rest stop position is selected as zero, what is Sarah’s position after
15
15​ minutes?
miles
miles
Preview
​
If the rest stop position is selected as zero, what is Ronald’s position after
15
15​ minutes?
miles
miles
Preview
​
What is the distance between Sarah and Ronald after
15
15​ minutes?
miles
miles
Preview

Answer 1

After 15 minutes:

- Sarah: 12 miles

- Ronald: 10 miles

Sarah is ahead of Ronald by 2 miles after 15 minutes of driving. We may assume Ronald is on his cell phone.

Explanation:

See the attached worksheet.

A table is shown with columns for the rest stop starting distance (0), the speeds in miles/hour (mph), the times for both drivers in minutes, as reported, and converted to hours, as needed for the calculation. The distance each travels is calculated by taking their speeds (in mph) times the driving times (15 minutes, or 0.25 hours). The green cells are Sarah's and Ronald's distances travelled (12 miles for Sarah and 10 miles for Ronald). Sarah is ahead by 2 miles (blue cell, the same color as Ronald at this point).