Polder filling

The polder has two tributaries. A larger inflow will fill an empty polder in 12 hours. The polder is already a quarter full. If we open both tributaries, the polder will be filled in 6 hours. How long would it take for a smaller inflow to fill an empty polder?

Final Answer:

b =  24 h

Step-by-step explanation:

 6 (121+b1) = 1  41  6 (b/12+1)=3/4b  6 (b/12+1)=3/4 b  3b=72  b=372=24  b=24=24 h



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