The total horizontal and vertical stresses at a point X in a saturated sandy medium are $170$ kPa and $300$ kPa, respectively. The static pore-water pressure is $30$ kPa. At failure, the excess pore-water pressure is measured to be $94.50$ kPa, and the shear stresses on the vertical and horizontal planes passing through the point X are zero. Effective cohesion is $0$ kPa and effective angle of internal friction is $36^{\circ}$. The shear strength (in kPa, up to two decimal places) at point X is _____

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