The water dam is filled up using the first tributary in 1 hour and 10 minutes, using the second tributary in 60 minutes. How many minutes it takes to fill the half of the dam using both of the tributaries,

The water dam is filled up using the first tributary in 1 hour and 10 minutes, using the second

tributary in 60 minutes. How many minutes it takes to fill the half of the dam using both of the
tributaries, if the second tributary will be opened 12 minutes after the first one ?

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The water dam is filled up using the first tributary in 1 hour and 10 minutes, using the second tributary in 60 minutes. How many minutes it takes to fill the half of the dam us…

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