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Time taken by boat upstream is 45 hrs more than downstream on the same day. (From passage: distance and stream speed given.) Find speed of boat in still water on Monday.

1. 22 kmph
2. 18 kmph
3. 20 kmph
4. 19 kmph

Correct answer: 20 kmph

Solution

Using the passage data (distance and stream speed), the formula: time_up - time_down = D/(b-s) - D/(b+s) = 45. Solving yields b=20 kmph.

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