Workers 2

The worker dug the trench for 7 hours, and another worker for 10 hours. They recruited to work even one worker. Digging should be done for 2 hours. For how long would dig the third worker alone?

Final Answer:

t3 =  3.8889 h

Step-by-step explanation:

t1=7 h t2=10 h t=2 h  t (t11+t21+t31)=1  t11+t21+t31=t1  z=1/t3  z=t1t11t21=2171101=70357010707=7035107=7018=3590.2571  t3=1/z=1/0.2571=3.8889 h



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