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A boat's downstream speed is 27 km/h and its upstream speed is 19 km/h. Which of the following is FALSE?

Competition practiceBoats & Streams
  • AIts still-water speed is 22 km/h
  • BThe current flows at 4 km/h
  • CIts still-water speed is 23 km/h
  • DThe two speeds differ by 8 km/h

Step-by-Step Solution

Still water = (27 + 19) ÷ 2 = 23 km/h and current = (27 − 19) ÷ 2 = 4 km/h; the speeds differ by 8. Only "22 km/h" is false.
Answer: A) Its still-water speed is 22 km/h

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