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Math Help - Simple speed/length/time question (Urgent)

  1. #1
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    Simple speed/length/time question (Urgent)

    Okey, person A swims across a lake at 3km/h, where person B jogs around. Person A use the same time as Person B to swim across of the lake as Person B runs around it one time.

    What's the speed of Person B?

    To long since I've done this stuff so stuck atm... Any help would be greatly appriciated!

    Could it be 3/2*pi
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  2. #2
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    person A swims in (2*r/3)hrs.

    so,speed of person B=(2*pi*r*3/2*r)km/h.
    =3*pi km/h.
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