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  • The excursion boat on the river takes 2.5h; hours to make the trip to a point 12 miles upstream and to return.If the rat

    The excursion boat on the river takes 2.5h; hours to make the trip to a point 12 miles upstream and to return.If the rate at which the boat travels in still water is 5 times the rate of the river current,what is the rate of the current?
    英語(yǔ)人氣:816 ℃時(shí)間:2020-05-07 07:35:48
    優(yōu)質(zhì)解答
    設(shè) the rate of the current is v,則 the rate of the boat travels is 5v,
    有12/(4v)+12/(6v)=2.5,v=2
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