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     EduGorilla 
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    A boat whose speed in 20 km/hr in still water goes 40 km downstream and comes back in a total of 5 hours. The approx. speed of the stream (in km/hr) is:

    Options :-

    1. 6 km/hr

    2. 9 km/hr

    3. 12 km/hr

    4. 16 km/hr

    5. 18 km/hr

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