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The graph models water in a community tank. \(t\) is measured in minutes, and \(V\) is measured in L

The model's domain is \(0 \le t \le 7\). The graph uses unit gridlines in the stated axis units

Cartesian graph with horizontal axis Filling time (minutes) and vertical axis Water volume (L). The window is x from -1 to 10 and y from 55 to 79, with unit gridlines in the displayed axis units. The model segment covers the stated domain from (0, 58) to (7, 72). Marked points: P is (3, 64), Q is (5, 68), R is (2, 62).02468105760636669727578PQRmodelFilling time (minutes)Water volume (L)
1 mark

What is the initial water volume?