Question
There are two inlet pipes 'M', 'N' and one outlet pipe 'O' in a tank. ‘M’ and ‘N’ can fill the tank in 12 minutes and 6 minutes respectively. ‘O’ is 50% less efficient than ‘M’. If ‘M’ and ‘O’ are open together but after 6 minutes ‘M’ is replaced with ‘N’, find the total time required to fill the tank completely.
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