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If a river flows at a speed of 5 km/h and a boat can travel at 15 km/h in still

Practice Questions

Q1
If a river flows at a speed of 5 km/h and a boat can travel at 15 km/h in still water, what is the speed of the boat upstream? (2021)
  1. 10 km/h
  2. 5 km/h
  3. 15 km/h
  4. 20 km/h

Questions & Step-by-Step Solutions

If a river flows at a speed of 5 km/h and a boat can travel at 15 km/h in still water, what is the speed of the boat upstream? (2021)
  • Step 1: Identify the speed of the river, which is 5 km/h.
  • Step 2: Identify the speed of the boat in still water, which is 15 km/h.
  • Step 3: To find the speed of the boat when going upstream, subtract the speed of the river from the speed of the boat in still water.
  • Step 4: Perform the subtraction: 15 km/h (boat speed) - 5 km/h (river speed) = 10 km/h.
  • Step 5: The result is the speed of the boat upstream, which is 10 km/h.
  • Relative Speed – Understanding how to calculate the effective speed of a boat when moving against the current of a river.
  • Speed Calculation – Applying basic arithmetic to determine the resultant speed of the boat in an upstream scenario.
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