Truck take you the some amount of clay in 30 hours. Second truck in 40 hours. Trucks carted the clay away some time together then the second truck broke down and the first one completed the job in five hours. What time worked together?

Correct answer:

x =  14.2857 h

Step-by-step explanation:

x (1/30+1/40)+5/30=1  7x=100  x=100714.285714=14.2857 h

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