Question

V=2.5(6.4−t)

Salma is filling her water jugs with spring water at the supermarket. The above equation gives the empty space in her jugs, VV, in US gallons, after tt minutes at a constant fill rate. How many minutes will it take to fill the jugs?

Answer 1

6.4 minutes ( or 6 minutes and 24 seconds)

Explanation:

Filling up the jug means the empty space is 0, hence V = 0.

We plug in 0 into V and solve for t to get the time required to fill it up:

`V=2.5(6.4-t)\\0=2.5(6.4-t)\\0=16-2.5t\\2.5t=16\\t=(16)/(2.5)\\t=6.4`

Hence it will take 6.4 minutes to fill up the jugs.

Note: 0.4 minutes in seconds is
`0.4*60=24` seconds