a) 80 min
b) 100 min
c) 20 min
d) 25 min
Answer: c
Explanation: Efficiency of pipe A,
$$\frac{{100}}{{20}}$$ = 5%
20% of efficiency of A = 1%
Then, efficiency of 5 such pipes = 5%.
Time taken to fill the tank = $$\frac{{100}}{5}$$ = 20 min.
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