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A boat is moving upstream at 10 km/h in a river that flows downstream at 5 km/h.

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Question: A boat is moving upstream at 10 km/h in a river that flows downstream at 5 km/h. What is the speed of the boat relative to the ground?

Options:

  1. 5 km/h
  2. 10 km/h
  3. 15 km/h
  4. 20 km/h

Correct Answer: 5 km/h

Solution: 

Speed of boat relative to ground = Speed of boat - Speed of river = 10 km/h - 5 km/h = 5 km/h.

A boat is moving upstream at 10 km/h in a river that flows downstream at 5 km/h.

Practice Questions

Q1
A boat is moving upstream at 10 km/h in a river that flows downstream at 5 km/h. What is the speed of the boat relative to the ground?
  1. 5 km/h
  2. 10 km/h
  3. 15 km/h
  4. 20 km/h

Questions & Step-by-Step Solutions

A boat is moving upstream at 10 km/h in a river that flows downstream at 5 km/h. What is the speed of the boat relative to the ground?
  • Step 1: Identify the speed of the boat moving upstream, which is 10 km/h.
  • Step 2: Identify the speed of the river flowing downstream, which is 5 km/h.
  • Step 3: To find the speed of the boat relative to the ground, subtract the speed of the river from the speed of the boat.
  • Step 4: Perform the calculation: 10 km/h (boat) - 5 km/h (river) = 5 km/h.
  • Step 5: The result, 5 km/h, is the speed of the boat relative to the ground.
  • Relative Speed – Understanding how to calculate the speed of an object in relation to another moving object.
  • Vector Addition – Applying vector addition principles to determine the resultant speed when two velocities are in opposite directions.
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