- A3.75 days
- B4 days
- C3.5 days
- D4.25 days
Step-by-Step Solution
Per day: down covers d/3, up covers d/5. Still-water speed = (d/3 + d/5)/2 = 4d/15 per day ⇒ time = 15/4 = 3.75 days. (4 days is the simple mean of the times.)
Answer: A) 3.75 days
A river steamer takes 3 days to sail down from one port to another and 5 days to sail back. How many days would the same journey take on still water?
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