Multiple choice

Speeds of a boat along the current and against the current are 10 km/hr and 8 km/hr, respectively. What is the speed (in km/hr) of the current?

  1. 1 km/hr

  2. 2 km/hr

  3. 3 km/hr

  4. 9 km/hr

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A Correct answer
Explanation

Let boat speed be B and current speed be C. B+C = 10 and B-C = 8. Subtracting the equations: 2C = 2, so C = 1 km/hr.

AI explanation

Using the formula for the speed of the current, which is half the difference between the downstream and upstream speeds, we get (10 - 8) / 2 = 1 km/hr.