- A15
- B3
- C12
- D18
Step-by-Step Solution
Downstream speed = 36/2 = 18 km/h; upstream speed = 36/3 = 12 km/h. Still-water speed = (18 + 12)/2 = 15 km/h.
Answer: A) 15
A launch covers 36 km downstream in 2 hours but takes 3 hours to come back up the same 36 km. Find its speed in still water.
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