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A river flows at a speed of 4 km/h. If a boat travels downstream at 12 km/h, wha

Practice Questions

Q1
A river flows at a speed of 4 km/h. If a boat travels downstream at 12 km/h, what is the speed of the boat relative to the river? (2020)
  1. 8 km/h
  2. 4 km/h
  3. 12 km/h
  4. 16 km/h

Questions & Step-by-Step Solutions

A river flows at a speed of 4 km/h. If a boat travels downstream at 12 km/h, what is the speed of the boat relative to the river? (2020)
  • Step 1: Identify the speed of the river, which is 4 km/h.
  • Step 2: Identify the speed of the boat when it is going downstream, which is 12 km/h.
  • Step 3: To find the speed of the boat relative to the river, subtract the speed of the river from the speed of the boat downstream.
  • Step 4: Perform the subtraction: 12 km/h (boat speed) - 4 km/h (river speed) = 8 km/h.
  • Step 5: The result, 8 km/h, is the speed of the boat relative to the river.
  • Relative Speed – Understanding how to calculate the speed of an object in relation to another moving object.
  • Downstream and Upstream Concepts – Differentiating between the speed of a boat when moving downstream versus upstream.
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