Tributaries 3243

The water reservoir is filled with one inflow in 30 hours and the other in 40 hours. Both tributaries were opened for some time, then the other tributary closed, and the reservoir filled in 5 hours. How long did the water flow in both tributaries at the same time?

Correct answer:

t =  14.3 h

Step-by-step explanation:

t1=30 h t2=40 h  t (1/t1+1/t2)+5/t1=1 t (1/30+1/40)+5/30=1  7t=100  t=7100=14.28571429  t=710014.285714=14.3 h



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