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A swimmer can swim at 3 km/h in still water. If the current of the river is 2 km

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Question: A swimmer can swim at 3 km/h in still water. If the current of the river is 2 km/h, what is the swimmer\'s speed relative to the bank when swimming upstream?

Options:

  1. 1 km/h
  2. 3 km/h
  3. 5 km/h
  4. 2 km/h

Correct Answer: 1 km/h

Solution: 

The swimmer\'s speed relative to the bank when swimming upstream is the swimmer\'s speed minus the current: 3 km/h - 2 km/h = 1 km/h.

A swimmer can swim at 3 km/h in still water. If the current of the river is 2 km

Practice Questions

Q1
A swimmer can swim at 3 km/h in still water. If the current of the river is 2 km/h, what is the swimmer's speed relative to the bank when swimming upstream?
  1. 1 km/h
  2. 3 km/h
  3. 5 km/h
  4. 2 km/h

Questions & Step-by-Step Solutions

A swimmer can swim at 3 km/h in still water. If the current of the river is 2 km/h, what is the swimmer's speed relative to the bank when swimming upstream?
  • Step 1: Identify the swimmer's speed in still water, which is 3 km/h.
  • Step 2: Identify the speed of the current in the river, which is 2 km/h.
  • Step 3: Understand that when swimming upstream, the swimmer's speed is reduced by the speed of the current.
  • Step 4: Calculate the swimmer's speed relative to the bank by subtracting the current's speed from the swimmer's speed: 3 km/h - 2 km/h.
  • Step 5: Perform the subtraction: 3 - 2 = 1 km/h.
  • Step 6: Conclude that the swimmer's speed relative to the bank when swimming upstream is 1 km/h.
  • Relative Speed – Understanding how to calculate the effective speed of an object in a moving medium, such as a swimmer in a river.
  • Vector Addition – Applying the concept of vector addition to determine the resultant speed when two velocities are acting in opposite directions.
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