P watch goes back to 1 min. day and Q watch goes back to ½ min. day ,after how many days P watch will be 5min. back then Q watch?

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National Institute of Pharmaceutical Education and Research (NIPER), Ahemdabad conducts NIPER Joint Entrance Examination (JEE).


P watch goes back to 1 min. day and Q watch goes back to ½ min. day ,after how many days P watch will be 5min. back then Q watch?