and 22 kn alooube – InterviewSolution

1.	and 22 kn alooube
Answer» Speed of boat in still water=x km/hrSpeed of stream=y km/hrSpeed of upstream=x-y km/hrSpeed of downstream=x+y km/hrLet 1/(x-y)=a and 1/(x+y)=bTime to go 25km up and 44 down=925a+44b=9----->(1)Time to go 15km up and 22km down=515a+22b=5------>(2)(2) × 2=> 30a+44b=10------>(3)(3)-(1)=>5a=1a=1/51/(x-y)=1/5x-y=5---->(4)Putting a=1/5 in (1),5+44b=944b=4b=1/111/(x+y)=1/11x+y=11---->(5)(4)+(5)=>2x=16x=8y=3Speed of boat in still water=8km/hrSpeed of stream=3km/hr

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