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word problem

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2. The excursion boat Holiday travels 35km upstream and then back again in 4h 48min. If the speed of the Holiday in still water is 15km/h, what is the speed of the current?

  • word problem -

    speed of current ---- x km/h

    speed against current --- 15-x
    speed with current ----- 15+x

    time against current = 35/(15-x)
    time with current = 35/(15+x)

    so solve
    35/(15-x) + 35/(15+x) = 4.8

    (I suggest multiplying each term by (5+x)(15-x), you will end up with a quadratic equation )

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