Three taps P, Q and R can fill a tank in 12 hrs, 15 hrs and 20 hrs respectively. If P is open all the time and Q and R are open for one hour each alternately, starting with Q, then the tank will be full in how many hours ?
A) 9 hrs
B) 7 hrs
C) 13 hrs
D) 11 hrs
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✒✒.Three taps P, Q and R can fill a tank in 12 hrs, 15 hrs and 20 hrs respectively. If P is open all the time and Q and R are open for one hour each alternately, starting with Q, then the tank will be full in how many hours ?
A) 9 hrs
B) 7 hrs✔✔✔✔
C) 13 hrs
D) 11 hrs
A) 9 hrs
B) 7 hrs✔✔✔✔
C) 13 hrs
D) 11 hrs
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