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a boat goes 24km upstream and 28km downstream in 6hrs . it goes 30km upstream and 21 km downstream in 6 1/2 hrs . find the speed of boat in still water and also speed of stream

Asked by Shailly Pandey(student), on 23/6/12

Answers

let the speed of the boat upstream =(x-y)km/hr

and the speed of the boat downstream=(x+y)km/hr

                                        A.T.Q

24/(X-Y)+28/(X+Y)=6              -(1.)             30/(X-Y)+21/(X+Y)=61/2            -(2.)

LET 1/(X-Y)=U &1/(X+Y)=V

24U+28V=6               -(1)

30U+21V=61/2          -(2.)

BY ELIMINATION PROCESS-:

    720U+840

Posted by deydebjit1...(student), on 23/6/12
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