Multiple choice

Speed of a boat in still water is 12 kmph, and river is running at 4 kmph. If this boat takes 12 hrs to reach a point P and come back to its original place, find the distance of point P.

  1. 60 km

  2. 48 km

  3. 64 km

  4. 80 km

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

Downstream speed = 12 + 4 = 16 kmph. Upstream speed = 12 - 4 = 8 kmph. Total time = 12 hours. Distance one way = d. d/16 + d/8 = 12. d/16 + 2d/16 = 12. 3d/16 = 12. d = 64 km.

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