Boats & Streams · Question 18 · Easy

A boat goes 42 km upstream in 6 hours. Its downstream speed is 13 km/h. What is the speed of the stream?

  1. 10 km/h
  2. 3 km/h
  3. 2 km/h
  4. 6 km/h
Answer and explanation

Answer: B. 3 km/h

Explanation: Upstream speed = 42 ÷ 6 = 7 km/h. Stream speed = (13 − 7)/2 = 3 km/h.

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