Jane took 30 min to drive her boat upstream to water-ski at her favorite spot. Coming back later in the day, at the same boat sp

Question

Jane took 30 min to drive her boat upstream to water-ski at her favorite spot. Coming back later in the day, at

the same boat speed, took her 10 min. If the current in that part of the river is 6 km per hr, what was her boat

speed in still water?

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Thu Nguyệt 4 years 2021-08-13T07:29:25+00:00 1 Answers 10 views 0

Answers ( )

  1. RobertKer
    0
    2021-08-13T07:31:13+00:00
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    Answer:

    Step-by-step explanation:

    Jane took 30 min to drive her boat upstream to water-ski at her favorite spot. Coming back later in the day, at

    the same boat speed, took her 10 min. If the current in that part of the river is 6 km per hr, what was her boat

    speed in still water?

    Let b+6 be downstream rate.

    and b-6 be upstream rate.

    Distance up = Distance down = (rate)(time)

    (b+6)(1/6 hr) = (b-6)(1/2 hr)

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