A ferry, when empty, travels twice as first as when it is full. It travels 20 miles south with a cargo, spends 30 minutes for unloading, and returns to its original port empty in total of 8 hours, what is the speed of the ferry when it is empty.

1. A ferry, when empty, travels twice as first as when it is full. It travels 20 miles south with a cargo, spends 30 minutes for unloading, and returns to its original port empty in total of 8 hours, what is the speed of the ferry when it is empty.

[AB Bank Asst. Officer-2014 : 2014]

1. 8 mph

2. 10 mph

3. 12 mph

4. 15 mph

5. None of these

Answer

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