A barge, when empty, travels twice as fast as when it is full. If it travels 20 miles north with a cargo, spends 30 minutes for unloading and return to its original port empty, completing the entire trip in 8 hours, what is the speed of the barge when it is empty?
A 8mph
B 10 mph
C 12 mph
D 15 mph
Solution
Correct Answer: Option A
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