A boat takes 3 hours to go 33 km downstream and it can go 21 km upstream in the same time. Find the speed of the stream and that of the boat in still water.
a. speed of boat = 8 km/hr , speed of stream = 3 km/hr
b. speed of boat = 9 km/hr , speed of stream = 2 km/hr
c. speed of boat = 3 km/hr , speed of stream = 8 km/hr
d. speed of boat = 2 km/hr , speed of stream = 9 km/hr
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a. speed of boat = 8 km/hr , speed of stream = 3 km/hr
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