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A boat can travel at a speed of 15 km/h in still water. If the speed of the stre

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Question: A boat can travel at a speed of 15 km/h in still water. If the speed of the stream is 3 km/h, what is the speed of the boat downstream?

Options:

  1. 12 km/h
  2. 15 km/h
  3. 18 km/h
  4. 20 km/h

Correct Answer: 18 km/h

Solution: 

Speed downstream = Speed of boat + Speed of stream = 15 + 3 = 18 km/h.

A boat can travel at a speed of 15 km/h in still water. If the speed of the stre

Practice Questions

Q1
A boat can travel at a speed of 15 km/h in still water. If the speed of the stream is 3 km/h, what is the speed of the boat downstream?
  1. 12 km/h
  2. 15 km/h
  3. 18 km/h
  4. 20 km/h

Questions & Step-by-Step Solutions

A boat can travel at a speed of 15 km/h in still water. If the speed of the stream is 3 km/h, what is the speed of the boat downstream?
  • Step 1: Identify the speed of the boat in still water, which is 15 km/h.
  • Step 2: Identify the speed of the stream, which is 3 km/h.
  • Step 3: To find the speed of the boat downstream, add the speed of the boat and the speed of the stream together.
  • Step 4: Calculate the total speed: 15 km/h (boat) + 3 km/h (stream) = 18 km/h.
  • Step 5: The speed of the boat downstream is 18 km/h.
  • Relative Speed – Understanding how to calculate the effective speed of a boat when considering the influence of a current or stream.
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