A) 18 mins
B) 20 mins
C) 22 mins
D) 24 mins
Correct Answer: B
Solution :
In order to solve this problem, first we need to find out whether the proportionality is direct or inverse. Now, here we note that, For more number of pipes, the time require to fill is less. For less number of pipes, the time required to fill is more. Hence, there is an inverse proportionality. \[10\times 16=(10-2)\times x\] where, \[X\] is the time required. \[\Rightarrow \] \[10\times 16=8\times x\] \[\Rightarrow \] \[x=\frac{10\times 16}{8}\] \[=10\times 2\] \[=20\,\,\operatorname{mins}\].
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