Multiple choice

If the speed of boat in still water is (10) km/hr and the speed of stream is (2) km/hr, then what is the upstream and downstream speeds (in km/hr) of the boat?

  1. $12, 16$
  2. $6, 12$
  3. $8, 12$
  4. $6, 14$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a boat moves downstream (with the current), its speed is the sum of its still-water speed and the stream speed: 10 + 2 = 12 km/hr. When moving upstream (against the current), the stream subtracts from the boat's speed: 10 - 2 = 8 km/hr.

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