- A3 km/h
- B6 km/h
- C2 km/h
- D4 km/h
Step-by-Step Solution
Net downstream shift = 2(15 + s) − 2(15 − s) = 4s = 12 ⇒ s = 3 km/h. The boat's own speed cancels out.
Answer: A) 3 km/h
A boat (15 km/h in still water) sails upstream for 2 hours and then turns and sails downstream for 2 hours. It ends up 12 km below its starting point. What is the speed of the current?
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