Two pipes can fill a tank in 30 hours and 40 hours, respectively. Find the time (in hours) taken to fill the tank when both the pipes are opened simultaneously.
A$$17\frac17$ hrs$
B$$17\frac37$ hrs$
C$$17\frac47$ hrs$
D$$17\frac27$ hrs$
A$$17\frac17$ hrs$
B$$17\frac37$ hrs$
C$$17\frac47$ hrs$
D$$17\frac27$ hrs$
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