Multiple choice

Speeds of a boat along the current and against the current are 14 km/hr and 7 km/hr, respectively. What is the speed of boat (in km/hr) in still water?

  1. 3.5

  2. 7.5

  3. 10.5

  4. 9.5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Speed in still water = (Speed downstream + Speed upstream) / 2 = (14 + 7) / 2 = 10.5 km/hr.

AI explanation

The speed of the boat in still water is half the sum of its downstream and upstream speeds. Adding the downstream speed of 14 km/hr to the upstream speed of 7 km/hr gives 21 km/hr, and dividing by 2 gives a speed of 10.5 km/hr. The result is 10.5 km/hr.

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