Father Sons Mowing Time

At six o'clock, the housekeeper will start mowing his lawn, which will take 12 hours. Two sons come to help him in an hour, and they will be together in 3 hours. How much would it take for just two sons to mow the lawn?

Final Answer:

s =  4.5 h

Step-by-step explanation:

4/12 + 3/s = 1  4/12s+3=s  4/12 s+3=s  8s=36  s=836=4.5  s=29=4.5=4.5 h



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