If a man swims 4 miters upstream at 1 mph and back downstream to the same point at 4 mph, what is his average speed ?

Created 1 year ago | Updated 3 days ago
(ক) 0.8 mph
(খ) 1.6 mph
(গ) 2.4 mph
(ঘ) 3.2 mph
No explanation available.

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