Jennifer travels first 4 hours of her journey at a speed of 80 miles/hr and the remaining distance in 6 hours at a speed of 30 miles/hr. What is her average speed in miles/hr?A)60miles/hrB)50miles/hrC)45miles/hrD)35miles/hr
Question
Jennifer travels first 4 hours of her journey at a speed of 80 miles/hr and the remaining distance in 6 hours at a speed of 30 miles/hr. What is her average speed in miles/hr?A)60miles/hrB)50miles/hrC)45miles/hrD)35miles/hr
Solution
To solve this problem, we first need to find out how far Jennifer traveled.
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For the first part of her journey, she traveled at 80 miles/hr for 4 hours. So, the distance she covered is 80 miles/hr * 4 hr = 320 miles.
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For the second part of her journey, she traveled at 30 miles/hr for 6 hours. So, the distance she covered is 30 miles/hr * 6 hr = 180 miles.
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The total distance she traveled is 320 miles + 180 miles = 500 miles.
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The total time she spent traveling is 4 hours + 6 hours = 10 hours.
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The average speed is total distance divided by total time. So, Jennifer's average speed is 500 miles / 10 hr = 50 miles/hr.
So, the answer is B) 50 miles/hr.
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