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If a boat can go 20 km upstream in 4 hours, what is the speed of the boat in sti

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Question: If a boat can go 20 km upstream in 4 hours, what is the speed of the boat in still water if the speed of the stream is 2 km/h?

Options:

  1. 3 km/h
  2. 4 km/h
  3. 5 km/h
  4. 6 km/h

Correct Answer: 5 km/h

Solution: 

Speed upstream = 20/4 = 5 km/h. Speed of the boat in still water = speed upstream + speed of stream = 5 + 2 = 7 km/h.

If a boat can go 20 km upstream in 4 hours, what is the speed of the boat in sti

Practice Questions

Q1
If a boat can go 20 km upstream in 4 hours, what is the speed of the boat in still water if the speed of the stream is 2 km/h?
  1. 3 km/h
  2. 4 km/h
  3. 5 km/h
  4. 6 km/h

Questions & Step-by-Step Solutions

If a boat can go 20 km upstream in 4 hours, what is the speed of the boat in still water if the speed of the stream is 2 km/h?
  • Step 1: Determine the speed of the boat going upstream. The boat travels 20 km in 4 hours.
  • Step 2: Calculate the speed upstream by dividing the distance by the time: 20 km ÷ 4 hours = 5 km/h.
  • Step 3: Identify the speed of the stream, which is given as 2 km/h.
  • Step 4: To find the speed of the boat in still water, add the speed upstream to the speed of the stream: 5 km/h + 2 km/h = 7 km/h.
  • Relative Speed – Understanding how the speed of a boat is affected by the current of the stream when moving upstream.
  • Speed Calculation – Calculating speed using distance and time, and applying it to find the speed in still water.
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