Final answer:
Salma will take 6.4 minutes to fill her water jug completely based on the given equation V = 2.5(6.4 - t) by setting V to 0 and solving for t.
Step-by-step explanation:
The student is asking about the time it will take for Salma to fill her water jugs with spring water.
The equation provided, V = 2.5(6.4 - t), represents the volume of empty space, V, in her jugs in US gallons after t minutes at a constant fill rate.
To find out when the jug is completely filled, we set V equal to zero and solve for t.
Setting V to zero gives us the equation:
0 = 2.5(6.4 - t).
By dividing both sides by 2.5, we obtain:
0 = 6.4 - t.
Solving for t yields:
t = 6.4 minutes.
Therefore, it will take Salma 6.4 minutes to fill her water jug.