Multiple choice

In an hour a boat goes 18 km. along the stream and 12 km. in still water. What is the speed of boat against the streem? एक घन्टे में एक नाव धारा के साथ 18 किमी. तथा शान्त जल में 12 किमी. जाती है। धारा के विपरीत नाव की चाल क्या होगी?

  1. 6 km./hr./किमी./घं.

  2. 8 km./hr./किमी./घं.

  3. 12 km./hr./किमी./घं.

  4. 4 km./hr./किमी./घं.
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A Correct answer
Explanation

Speed in still water = 12 km/hr. Downstream speed = 18 km/hr. Speed of stream = downstream - still water = 18 - 12 = 6 km/hr. Upstream speed (against stream) = still water - stream speed = 12 - 6 = 6 km/hr.

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