Trucks

The truck takes you some amount of clay in 30 hours. The second truck takes the same amount of clay 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 (301+401)+305=1  x (1/30+1/40)+5/30=1  7x=100  x=7100=14.28571429  x=710014.285714=14.2857 h



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