ratio between the speed of boat in still water to the speed of the current is 2:1 total time taken by a man to cover 72 km in up stream and comeback is 32 hours. then find the down stream speed.
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u/v=2:1 then ds =3x ans us =1x
32=72/1x+72/3x
32=96/x
x=3
then ds=9 km/hour
Step-by-step explanation:
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