Multiple choice

The ratio of the speed of a boat in still water to that of stream is 2 : 1. What will be the ratio of speed of the boat upstream to speed of the boat downstream?

  1. 3 : 2

  2. 5 : 9

  3. 7 : 3

  4. 1 : 3

  5. 3 : 1
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D Correct answer
Explanation

Let boat speed be 2x and stream speed be x. Upstream speed is 2x - x = x, and downstream speed is 2x + x = 3x. The ratio is x : 3x, which simplifies to 1 : 3.

AI explanation

Let the speed of the boat in still water be 2x and the speed of the stream be x. The upstream speed is calculated as 2x minus x, which equals x. The downstream speed is calculated as 2x plus x, which equals 3x. The ratio of the upstream speed to the downstream speed is therefore x divided by 3x, which simplifies to 1 is to 3.

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