Garden weeding

Dana was supposed to dig a vegetable patch in the garden. She would have carved it in 1.5 hours if she had worked alone. If her sister Hannah were to cut it alone, she would carve it in 0.75 hours. How long would it take them to weed the garden together?

Final Answer:

t =  30 min

Step-by-step explanation:

t1=1.5 h min=1.5 60  min=90 min t2=0.75 h min=0.75 60  min=45 min  h=1/t1+1/t2=1/90+1/45=3010.0333 1/h  t h=1  t=1/h=1/0.0333=30 min



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