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MMLU-Pro / 9098 / A boat travels directly upstream in a river, moving with constant but unknown…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

A boat travels directly upstream in a river, moving with constant but unknown speed v with respect to the water. At the start of this trip upstream, a bottle is dropped over the side. After 15 minutes the boat turns around and heads downstream. It catches up with the bottle when the bottle has drifted one mile downstream from the point at which it was dropped into the water. What is the current in the stream?

category

physics

options

  1. 2 miles per hour
  2. 1 mile per hour
  3. 2.5 miles per hour
  4. 3 miles per hour
  5. 5 miles per hour
  6. 4 miles per hour
  7. 1.5 miles per hour
  8. 0.5 miles per hour
  9. 0.75 miles per hour
  10. 3.5 miles per hour

src

stemez-Physics

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