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If a river's current is 3 km/h and a boat travels downstream at 12 km/h, what is

Practice Questions

Q1
If a river's current is 3 km/h and a boat travels downstream at 12 km/h, what is the speed of the boat relative to the riverbank? (2022)
  1. 9 km/h
  2. 15 km/h
  3. 12 km/h
  4. 3 km/h

Questions & Step-by-Step Solutions

If a river's current is 3 km/h and a boat travels downstream at 12 km/h, what is the speed of the boat relative to the riverbank? (2022)
  • Step 1: Identify the speed of the river's current, which is 3 km/h.
  • Step 2: Identify the speed of the boat when it is traveling downstream, which is 12 km/h.
  • Step 3: To find the speed of the boat relative to the riverbank, add the speed of the boat to the speed of the river.
  • Step 4: Calculate the total speed: 12 km/h (boat) + 3 km/h (river) = 15 km/h.
  • Step 5: The speed of the boat relative to the riverbank is 15 km/h.
  • Relative Speed – Understanding how to calculate the speed of an object in relation to another moving object.
  • Downstream Motion – Recognizing that when moving downstream, the speed of the current adds to the speed of the boat.
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