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A boat can travel at 15 km/h in still water. If it goes upstream against a curre

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Question: A boat can travel at 15 km/h in still water. If it goes upstream against a current of 3 km/h, what is its speed upstream?

Options:

  1. 10 km/h
  2. 12 km/h
  3. 15 km/h
  4. 18 km/h

Correct Answer: 10 km/h

Solution: 

Upstream speed = Speed in still water - Speed of current = 15 km/h - 3 km/h = 12 km/h.

A boat can travel at 15 km/h in still water. If it goes upstream against a curre

Practice Questions

Q1
A boat can travel at 15 km/h in still water. If it goes upstream against a current of 3 km/h, what is its speed upstream?
  1. 10 km/h
  2. 12 km/h
  3. 15 km/h
  4. 18 km/h

Questions & Step-by-Step Solutions

A boat can travel at 15 km/h in still water. If it goes upstream against a current of 3 km/h, what is its speed upstream?
  • Step 1: Identify the speed of the boat in still water, which is 15 km/h.
  • Step 2: Identify the speed of the current, which is 3 km/h.
  • Step 3: To find the speed of the boat going upstream, subtract the speed of the current from the speed of the boat in still water.
  • Step 4: Perform the subtraction: 15 km/h (boat speed) - 3 km/h (current speed) = 12 km/h.
  • Step 5: The speed of the boat going upstream is 12 km/h.
  • Relative Speed – Understanding how to calculate the effective speed of a boat when considering the impact of a current.
  • Basic Arithmetic – Applying subtraction to determine the resultant speed from two different speeds.
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