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Question

A tank is connected with 8 pipes. Some of them are inlet pipes and rest work as outlet pipes. Each of the inlet pipe can fill the tank in 8 hours, individually, while each of those that empty the tank i.e., outlet pipe, can empty it in 6 hours individually. If all the pipes are kept open when the tank is full, it will take exactly 6 hours for the tank to empty. How many of these are inlet pipes? 
 


Your Answer
A
2
Correct Answer
B
4
Your Answer
C
5
Your Answer
D
6

Solution

The correct option is C 4
Let there be 'n' inlet pipes then there must be (8-n) outlet pipes
Therefore (8n)16n×18=16n=4

Alternatively: (8n)16.66n×12.5=16.66n=116.6629.16=700175=4

Alternatively: It can be solve through options very easily.

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