a motorboat can travel 30km upstream and 23 km downstream in 7 hrs.it can travel 21km upstream and return in 5 hrs.find the speed of the boat in still water and speed of the stream.
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motor boat ka speed x man lo
x-23/7 =x+21/5 solve kar do ho jayega
x-23/7 =x+21/5 solve kar do ho jayega
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