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medium · GMAT Quantitative Reasoning

A boat travels 36 km downstream in 3 hours. The return trip upstream over the same 36 km takes 4.5 hours.

What is the speed of the current?

  1. 4 km/h
  2. 2 km/h
  3. 10 km/h
  4. 20 km/h
  5. 1.5 km/h

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