A man travels 100 miles at 20 miles per hour, 60 miles at 30 miles per hour and 80 miles at 10 miles per hour, what is his average rate for the three trips?
A. 18 miles per hr
B. 17 miles per hr
C. 20 miles per hr
D. 16 miles per hr
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সঠিক উত্তরঃ
D.
16 miles per hr
Explanation:
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