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29 Jun 2023, 01:30
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
94% (01:05) correct
6%
(01:00)
wrong
based on 106
sessions
History
Date
Time
Result
Not Attempted Yet
Joel sailed for 3 hours at a speed of 20 miles per hour, then for 6 hours at 30 miles per hour and finally, 1 more hour at 40 miles per hour. What was the average speed of Joel during the whole sail?
A. 25
B. 27.5
C. 28
D. 30
E. 32
A. 25
B. 27.5
C. 28
D. 30
E. 32
29 Jun 2023, 05:37
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To calculate the average speed, we need to find the total distance traveled and divide it by the total time taken.
Distance = Speed × Time = 20 miles/hour × 3 hours = 60 miles
Distance covered in the second leg:
Distance = Speed × Time = 30 miles/hour × 6 hours = 180 miles
Distance covered in the third leg:
Distance = Speed × Time = 40 miles/hour × 1 hour = 40 miles
Total distance = 60 miles + 180 miles + 40 miles = 280 miles
Now, let's calculate the total time taken:
Total time = 3 hours + 6 hours + 1 hour = 10 hours
Average Speed = Total Distance / Total Time = 280 miles / 10 hours = 28 miles/hour
The correct option is C
Distance = Speed × Time = 20 miles/hour × 3 hours = 60 miles
Distance covered in the second leg:
Distance = Speed × Time = 30 miles/hour × 6 hours = 180 miles
Distance covered in the third leg:
Distance = Speed × Time = 40 miles/hour × 1 hour = 40 miles
Total distance = 60 miles + 180 miles + 40 miles = 280 miles
Now, let's calculate the total time taken:
Total time = 3 hours + 6 hours + 1 hour = 10 hours
Average Speed = Total Distance / Total Time = 280 miles / 10 hours = 28 miles/hour
The correct option is C
