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A boat can travel at 10 km/h in still water. If it is moving downstream in a riv

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Question: A boat can travel at 10 km/h in still water. If it is moving downstream in a river flowing at 5 km/h, what is the speed of the boat relative to the riverbank?

Options:

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

Correct Answer: 15 km/h

Solution: 

Speed downstream = Speed of boat + Speed of river = 10 km/h + 5 km/h = 15 km/h.

A boat can travel at 10 km/h in still water. If it is moving downstream in a riv

Practice Questions

Q1
A boat can travel at 10 km/h in still water. If it is moving downstream in a river flowing at 5 km/h, what is the speed of the boat relative to the riverbank?
  1. 5 km/h
  2. 10 km/h
  3. 15 km/h
  4. 20 km/h

Questions & Step-by-Step Solutions

A boat can travel at 10 km/h in still water. If it is moving downstream in a river flowing at 5 km/h, what is the speed of the boat relative to the riverbank?
Correct Answer: 15 km/h
  • Step 1: Understand that the boat's speed in still water is 10 km/h.
  • Step 2: Know that the river is flowing at 5 km/h downstream.
  • Step 3: When the boat is moving downstream, its speed adds to the speed of the river.
  • Step 4: To find the total speed of the boat relative to the riverbank, add the speed of the boat (10 km/h) to the speed of the river (5 km/h).
  • Step 5: Calculate the total speed: 10 km/h + 5 km/h = 15 km/h.
  • Step 6: Conclude that 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.
  • Vector Addition – Applying the concept of adding velocities in the same direction to find the resultant speed.
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