Question

units
Thinking Cap
Tap X fills a cistern in 4 hours,
outlet pipes Y and Z can empty
the cistern in 6 hours and 8
hours respectively. If the cistern
is empty and X and Y are turned
on, how long will it take to fill up
the cistern? After the cistern is
full, X, Y and Z are all turned on.
How long will the cistern take to
be empty?
$142555.( {?}^{?}$
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Answer 1

Answer:

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Answer 2

Answer:

___________ is medium of communication through which we command with the computer.