A motorboat, whose speed in 20 km/hr in still water goes 36 km downstream and…

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A motorboat, whose speed in 20 km/hr in still water goes 36 km downstream and comes back in a total of 3 hours 45 minutes. The speed of the stream (in km/hr) is ?

  1. A.

    8

  2. B.

    6

  3. C.

    4

  4. D.

    5

Attempted by 4 students.

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Correct answer: C

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