A ferry can travel twice as fast when empty as when it is full. It travels 20 mile with full load, spends 1 hour for unloading and returns to its original port empty. It took 11 hours to complete the journey. What is the speed of the ferry when it is empty?

Created 1 year ago | Updated 3 days ago
(ক) 5
(খ) 6
(গ) 6.5
(ঘ) 8
No explanation available.

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