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Speed of boat in still water is 19 km/h...

Speed of boat in still water is 19 km/h and speed of stream is 11 km/h. The boat takes total `9(1)/(2)` hours to go and come back. Find the length of the river.

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The correct Answer is:
60 km
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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-BOATS AND STREAM-QUESTIONS
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