Henry111 asked in 科學及數學數學 · 9 years ago

Help! F.1 maths question

Peter and Mary run with speed 1.2m/s and 4 km/h respectively.

If the track is 400m long,how long does Peter take to overlap Mary?

1 Answer

  • 9 years ago
    Favorite Answer

    Do such question, normally you set Y be the answer you want to find,

    here, i.e., the time take for Peter to overlap Mary (Y in second)

    Then form the equation:

    (When Peter ran 400m far from Mary, then he overlap)

    1.2m/s x Y = 4km/h x Y + 400

    resolve all unit to meter

    1.2Y = (4000/3600)Y + 400

    Y = 4500

    So it take 4500 seconds to overlap Mary

    (or 75 minutes)

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