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Downstream and upstream speeds of a boat are 21 km/h and 15 km/h. Which of these statements is true?

Competition practiceBoats & Streams
  • AUpstream speed is 70% of downstream
  • BThe stream speed is 4 km/h
  • CIts still-water speed is 18 km/h
  • DThe stream speed is 6 km/h

Step-by-Step Solution

Still water = km/h ✓. Stream = km/h, so 6 and 4 are wrong. , not 70%.
Answer: C) Its still-water speed is 18 km/h

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