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Math Help - Help me to sort out this maths problems!!!!!

  1. #1
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    Exclamation Help me to sort out this maths problems!!!!!

    1. The diameter of the driving wheel of a bus is 140 cm. How many revolutions per minute must the wheel make in order to keep a speed of 66kmph?
    2. A is twice as good as B and together they finish a piece of work in 18 days. In how many days will A alone finish the work?
    3. A farmer built a fence around his 17 cows in a square shaped region. He used 27 fence poles on each side of the square. How many poles did he need altogether?


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  2. #2
    MHF Contributor
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    Diameter = 140 cm

    Circumference = \pi*Diameter = \pi * 140\;cm

    Distance Travelled / Rev = Circumference / Rev = \pi * 140\;cm / Rev

    66\;\frac{km}{hr} * \frac{1000\;m}{1\;km} * \frac{100\;cm}{1\;m} * \frac{1\;hr}{60\;min}

    Now what?
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