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Boat P is twice as fast as boat Q in still water. On a river flowing at 3 km/h, P goes 50 km upstream in the same time that Q goes 40 km downstream. What is P's speed in still water?

Competition practiceBoats & Streams
  • A18 km/h
  • B9 km/h
  • C15 km/h
  • D12 km/h

Step-by-Step Solution

Let ⇒ ⇒ km/h. Check: 50/15 = 40/12 = 3⅓ h ✓.
Answer: A) 18 km/h

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