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With a still-water speed of 15 km/h on a river flowing at 5 km/h, what is the ratio of the time taken upstream to the time taken downstream over the same distance?

Competition practiceBoats & Streams
  • A1 : 2
  • B3 : 2
  • C3 : 1
  • D2 : 1

Step-by-Step Solution

Speeds: downstream 20, upstream 10. For a fixed distance time is inversely proportional to speed, so upstream : downstream time = .
Answer: D) 2 : 1

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