Question

One pump can fill a reservoir in 60 hours. Another pump can fill the same reservoir in 80 hours. A third pump can empty the reservoir in 90 hours. If all three pumps are operating at the same time, how long will it take to fill the reservoir?

i got 55.38 hours but i want to know how many minutes are in 0.38 of an hour also i want to know if this is correct

Answer 1

i just remembered that it says how many hour so woul it be 55 hours or 56 becuse of the .38

Answer 2

I don't see where it wants the number of hours only.
I see "how long will it take ....."

your answer of 55.3846... is correct
so that would be 55 hours and .3846... of an hour
so .3846..(60) = 23.0769... minutes

if you wanted it broken down into seconds, use the decimal .0769(60) seconds or appr 4.6 seconds

in time notation:
55 : 23 : 4.6 --- hours : minutes : seconds