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Two pipes A and B can fill a tank in 6 hrs and 4 hrs respectiv | ZITY AIM

Two pipes A and B can fill a tank in 6 hrs and 4 hrs respectively. If they are opened in alternate hours and if pipe A is opened first, then the tank shall be filled in?
Anonymous Quiz
0%
7 hr
50%
5 hr
50%
4 hr
0%
8 hr