One tube fills the pool in 15 hours. How many hours and minutes will it take to fill the pool with 4 same type tubes?

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Answer 1 · 2018-06-26T11:27:43

#color(blue)(3 " hrs " 45 " minutes"#

This is a case of inverse variation:

For inverse variation, we have:

#y prop k/x^n#

Where #bbk# is the constant of variation.

We need to find this constant #bbk#

Let #y# be the number of hours taken. Let #x# be the number of tubes.

#y=15# and #x=1#

#:.#

#15=k/1#

#k=15#

Now if we have 4 tubes:

#x=4#

#y=15/4=3 3/4#hrs

or:

#3 " hrs " 45 " minutes"#