sue can shovel snow from her driveway in 60 minutes. Tom can do the same job in 35 minutes. how long would it take Sue and Tom to shovel the driveway if they work together?

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  1. sue's rate = 1/60 (driveways/minute)
    Tom's rate = 1/35 (driveways/minute)
    combined rate = 1/60+1/35 = 19/420 (driveways/minute)

    time at combined rate = driveway/( (19/420) (driveways/minute) )
    = 420/19 minutes
    = 22.1 minutes

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