Could any one please explain I didn't got this

A diagonal of the square has length \(5 \sqrt{2}\). It follows that the distance from the boulder to one of the bushes is less than \(5 \sqrt{2}\). Since there are six bushes inside the garden, the sum of the distances from the boulder to each of the bushes is less than \(6 \times 5 \sqrt{2} = 30 \sqrt{2}\)

\(30 \sqrt{2 } < 30 ⋅ 1.5 = 45
\)


B is the answer