A worker releases boxes at the top of a ramp. From the bottom of the ramp the boxes slide \(10 \mathrm{~m}\) across the floor to a barrier wall. If the ramp is at an elevation angle of \(20^{\circ}\), how long must the ramp be if the boxes are to reach the wall \(2.0 \mathrm{~s}\) after leaving the ramp? Ignore friction.