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A river's current is 5 km/h. If a boat travels downstream at 15 km/h, what is th

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Question: A river\'s current is 5 km/h. If a boat travels downstream at 15 km/h, what is the effective speed of the boat relative to the riverbank?

Options:

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

Correct Answer: 20 km/h

Solution: 

Effective speed downstream = Speed of boat + Speed of river = 15 km/h + 5 km/h = 20 km/h.

A river's current is 5 km/h. If a boat travels downstream at 15 km/h, what is th

Practice Questions

Q1
A river's current is 5 km/h. If a boat travels downstream at 15 km/h, what is the effective speed of the boat relative to the riverbank?
  1. 10 km/h
  2. 20 km/h
  3. 15 km/h
  4. 5 km/h

Questions & Step-by-Step Solutions

A river's current is 5 km/h. If a boat travels downstream at 15 km/h, what is the effective speed of the boat relative to the riverbank?
  • Step 1: Identify the speed of the river's current, which is 5 km/h.
  • Step 2: Identify the speed of the boat when it is traveling downstream, which is 15 km/h.
  • Step 3: To find the effective speed of the boat relative to the riverbank, add the speed of the boat to the speed of the river.
  • Step 4: Calculate the effective speed: 15 km/h (boat speed) + 5 km/h (river speed) = 20 km/h.
  • Step 5: The effective speed of the boat relative to the riverbank is 20 km/h.
  • Relative Speed – Understanding how to calculate the effective speed of an object when considering the influence of another moving object (in this case, the river current).
  • Downstream vs. Upstream – Recognizing the difference in speed calculations when moving with the current (downstream) versus against it (upstream).
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