On a certain nonstop trip, Marta averaged x miles per hour for 2 hours and y miles per hours for the remaining 3 hours. What was her average speed in miles per hour for the entire trip?
i. 2x + 3y = 280
ii. y = x + 10
A. 1
B. 2
C. 3
D. 4
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সঠিক উত্তরঃ
A.
1
Explanation:
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