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Sveta_85 [38]
2 years ago
11

Kerri drives $150$ miles to visit her grandmother. She starts off driving $60$ miles per hour, but then encounters road construc

tion and has to drive $20$ miles per hour the rest of the way. If she spends the same amount of time at the faster speed as at the slower speed, then how many hours did her $150$-mile trip take in total?
Mathematics
1 answer:
andriy [413]2 years ago
5 0

Answer:

5 hours

Step-by-step explanation:

-150 miles in all

-75 miles per speed

<u>60 mph...</u>

60 miles per hour over 75 miles

75 miles ÷ 60 miles = 1.25 hours

<u>20 mph...</u>

20 miles per hour over 75 miles

75 miles ÷ 20 miles = 3.75 hours

<u>Total hours of driving...</u>

60 mph for 1.25 hours

20 mph for 3.75 hours

3.75 hours + 1.25 hours = 5 hours total

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