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A boat can travel at a speed of 15 km/h in still water. If it goes downstream, i

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Question: A boat can travel at a speed of 15 km/h in still water. If it goes downstream, its speed increases by 5 km/h. What is its speed downstream?

Options:

  1. 15 km/h
  2. 20 km/h
  3. 25 km/h
  4. 30 km/h

Correct Answer: 20 km/h

Solution: 

Speed downstream = Speed in still water + Speed increase = 15 km/h + 5 km/h = 20 km/h.

A boat can travel at a speed of 15 km/h in still water. If it goes downstream, i

Practice Questions

Q1
A boat can travel at a speed of 15 km/h in still water. If it goes downstream, its speed increases by 5 km/h. What is its speed downstream?
  1. 15 km/h
  2. 20 km/h
  3. 25 km/h
  4. 30 km/h

Questions & Step-by-Step Solutions

A boat can travel at a speed of 15 km/h in still water. If it goes downstream, its speed increases by 5 km/h. What is its speed downstream?
  • Step 1: Identify the speed of the boat in still water, which is 15 km/h.
  • Step 2: Identify the increase in speed when the boat goes downstream, which is 5 km/h.
  • Step 3: Add the speed in still water (15 km/h) to the speed increase (5 km/h).
  • Step 4: Calculate the total speed downstream: 15 km/h + 5 km/h = 20 km/h.
  • Step 5: Conclude that the speed of the boat downstream is 20 km/h.
  • Speed Calculation – Understanding how to calculate the speed of a boat in different conditions, specifically in still water and when affected by current.
  • Downstream vs. Upstream – Recognizing the difference in speed when traveling downstream (with the current) versus upstream (against the current).
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