Answer:
No. of pipes 5 6 Time taken x min. 80 min.
Let x be the time taken to fill the tank with 5 pipes. So, \[\frac{6}{5}\times 80=x\] \[\Rightarrow \,\,\,\,\,\,\,\text{ }x=16\times 6\] \[\Rightarrow \text{ }\,\,\,\,\,\,x=96\text{ }min\] or x = 1 hour 36 minutes.
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