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A pump fills a pool at a rate of 20 cubic meters per hour. If each cubic meter of water is valued at $10, how many minutes will the pump need to work to transfer $300 worth of water?

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  1. You should be able to do this in your head.
    At $10 per cubic metre, $300 will give you 30 cubic metres

    if it takes 1 hour to pump 20 m^3
    should it not take 1.5 hours, or 90 minutes to pump 30 m^3

    ( Wow, where do you live? Up here in Canada, 1 m^3 cost a bit more than $1.00 )

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  2. It takes 90 minutes!

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  5. It takes 90 minutes!

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