Question

Directions for Questions 6 to 10: Read the following
and answer the questions that follow.
A set of 10 pipes (set X) can fill 70% of a tank in
7 minutes. Another set of 5 pipes (set Y) fills 3/8 of the tank
in 3 minutes. A third set of 8 pipes (set Z) can empty 5/10 of
the tank in 10 minutes.
6. How many minutes will it take to fill the tank if all the
23 pipes are opened at the same time?
5
(b) 5-minutes
7
(a) 5 minutes
(c) 6 minutes
5
(d) 6-minutes
7.​

Answer 1

1 is the ansewr because of some respective reason