Mow the lawn

Dano would mow the lawn in 12 hours and Milada in 16 hours. How long will take the lawn mow together?

Correct answer:

t =  6.8571 h

Step-by-step explanation:

x=1/12+1/16=4870.1458 t=1/x=1/0.1458=6.8571 h

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