Park work groups

Two working groups are adjusting the park. The first group will do the work in 15 days and the second in 25 days. How many days will they work together?

Final Answer:

t =  9.375 d

Step-by-step explanation:

t1=15 d t2=25 d  k=t11+t21=151+251=755+753=755+3=7580.1067 1/d  t k=1  t=1/k=1/758=1:758=1 875=81 75=875=875 d=9.375 d



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