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March 24, 2017

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22. A motor boat whose speed is 18 km/h in still water takes 1 hour more to go 24 km upstream than to return downstream to the same spot. Find the speed of the stream

  • maths - ,

    Let speed x
    Speed= D/T
    Speed of the boat in upstream= 24/18-x (equation 1)
    Speed of boat in down stream= 24/18+x (equation 2)
    (Equation 1-2)
    24/18-x - 24/18+x= 1
    24/18-x= 1+ 24/18+x=18+x+24/x+18=42+x / x+18
    28/ x-18= 42+x/x+18

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