Question

A set of 10 pipes (set X) can fill 70% of a tank in
minutes:. Another set of 5 pipes (set Y) tills 318 of the lant
in 3 minutes. A third set of 8 pipes (set 2) can empty 510
of the tank in 10 minutes (Q1) If only half the pipes of set X are closed and only
half the pipes of set Y are open and all other pipes are
open, how long will it take to fill 49% of the tank?
(a) 16 minutes
(b) 13 minutes
(c) 7 minutes
(d) 8 minutes
(e) None of these

Answer 1

a. 16 minutes

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