Multiple choice

A boat runs at a speed of 27 km/h along the stream. If the speed of the stream is 3.5 km/h, then at what speed will the boat run against the stream?

  1. 30.5

  2. 20

  3. 23.5

  4. 20.5

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Speed downstream = Boat + Stream = 27. Speed of stream = 3.5. Boat speed = 27 - 3.5 = 23.5. Speed upstream = Boat - Stream = 23.5 - 3.5 = 20.

AI explanation

Using the upstream speed formula, we subtract the stream speed from the boat's downstream speed to find its speed in still water. This yields a still water speed of 27 - 3.5 = 23.5 km/h, and subsequently the upstream speed is 23.5 - 3.5 = 20 km/h.

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