How long will it take to fill the pool using all 4 taps at once

How long will it take to fill the pool using all 4 taps at once?
Our Solution:
First, work out how much of the pool gets filled by each tap in one hour.

The first tap takes 48 hours to fill the pool, so in one hour it fills 1/48 of the pool
The second tap 1/72
The third tap 1/96
And the fourth tap fills 1/6 of the pool

We need to add all those fractions together:

1/48 + 1/72 + 1/96 + 1/6 = 6/288 + 4/288 + 3/288 + 48/288 = 61/288

So, in one hour the pool will be 61/288 full

And it will be completely full in 288/61 hours = 4 hours 43 minutes and 17 seconds.
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