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 returns to its original port empty, completing the entire trip in 8 hours, what is the speed of the barge when it is empty?

General Mathematics Part

1. 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 returns to its original port empty, completing the entire trip in 8 hours, what is the speed of the barge when it is empty?

[Dhaka Bank MTO-2011 : 2011]

1. 8 mph

2. 10 mph

3. 12 mph

4. 15 mph

5. None of these

Answer

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