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algebra

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if ne person can do 25 sqare feet in 4 hours and another in 5 hours how much concrete can they do working together in 8 hours\
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  • algebra -

    rate of 1st person = 25/4 ft^2/h
    rate of 2nd person = 25/5 ft^2/h
    combined rate = (25/4+25/5) or 45/4 ft^2/h

    so area in 8 hrs = 8(45/4) ft^2
    = 90 ft^2

    or

    1st person can do 25 fT2 in 4 hrs, so he can do 50 ft^2 in 8 hrs
    2nd person does 25/5 or 5 ft^2 in 1 hour , so in 8 hours he does 40 ft^2
    50+40 = 90

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