Question

Ms. Lewis plans to drive 900 miles to her vacation destination, driving an average of 50 miles per hour. . How many miles per hour faster must she average, while driving, to reduce her total driving time by 3 hours? A. 5 B. 8 C. 10 D. 15 E. 18
Please explain how you got your answer and I know the answer is C but I don't know how​

Answer 1

Answer:

C

Step-by-step explanation:

900 divided by 50 is 18. it will take 18 hours to get to her destination at this speed.

try adding 10 to 50, to speed up by 10 mph

900 divided by 60 is 15

15 is 3 hours less than 18

Answer 2

Answer: C. 10

Step-by-step explanation:

Ms. Lewis is driving 50mph and is driving a distance of 900 miles. 900/50 is 18, making her total drive 18 hours long. She wants to bring her total driving time down by 3 hours, making it 15 hours. To solve this, divide 900 by 15 (900/15), and you'll get 60. Finally, subtract 60 and 50 (60 - 50), and your answer is 10. Hope this helps.