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  1. The speed of a boat downstream is 15 km/hr and the speed of the stream is 1.5 km/hr. The speed of the boat upstream ?
    1. 13.5 km/hr
    2. 16.5 km/hr
    3. 12 km/hr
    4. 8.25 km/hr
Correct Option: C

Speed of boat in still water = 15 - 1.5 = 13.5 km/hr
Speed of boat in upstream = 13.5 - 1.5 = 12 km/hr


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