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A ferry's speed in still water is 10 km/h and the river flows at 2 km/h. It goes 48 km downstream and comes back. What is the total time for the round trip?

Competition practiceBoats & Streams
  • A9.6 hours
  • B8 hours
  • C12 hours
  • D10 hours

Step-by-Step Solution

Downstream: h. Upstream: h. Total = 10 h. (Ignoring the stream gives h.)
Answer: D) 10 hours

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