Question

Three taps A, B, C fill up a tank independently in 10
h, 20 h, 30 h, respectively. Initially, the tank is empty
and exactly one pair of taps is open during each hour
and every pair of taps is open at least for 1 hour. What
is the minimum number of hours required to fill the
tank
[KVPY-2011]
(A) 8
(B) 9
(C) 10
(D) 11
​

Answer 1

Answer:

A. 8i hope answer is correct