Jeffrey travels by car at an average speed of 60 miles per hour for 4 hours and then at an average speed of 40 miles per hour for hours. What is his average speed, in miles per hour, for the entire 6-hour trip?5 Mark For ReviewA) 50B) C) 55D)
Question
Jeffrey travels by car at an average speed of 60 miles per hour for 4 hours and then at an average speed of 40 miles per hour for hours. What is his average speed, in miles per hour, for the entire 6-hour trip?5 Mark For ReviewA) 50B) C) 55D)
Solution
To find the average speed for the entire trip, we need to divide the total distance travelled by the total time taken.
First, let's calculate the total distance travelled:
For the first part of the trip, Jeffrey travels at 60 miles per hour for 4 hours, so he covers a distance of 60 * 4 = 240 miles.
For the second part of the trip, he travels at 40 miles per hour for 2 hours (since the total trip is 6 hours), so he covers a distance of 40 * 2 = 80 miles.
So, the total distance travelled is 240 + 80 = 320 miles.
The total time taken is 6 hours.
Therefore, the average speed for the entire trip is 320 miles / 6 hours = 53.33 miles per hour.
So, the answer is not listed among the options you provided. There might be a mistake in the question or the options.
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