$3)$ The transport aircraft Boeing $767-200$ with a mass of $143,000$ kg and two turbofan engines each generating a sea$-$level thrust of $222$ kN is required to descend from $15,000$ to $14,000$ ft$.$ In this descending flight, the airspeed should be decreased from $200$ to $190$ m$/$s when a $15$ km horizontal distance is covered. Determine what percent$-$ age of the engine thrust should be employed at the beginning of this descent. Assume that the deceleration in the z$-$axis is zero. Other characteristics of the aircraft are given as S $=283\mathrm{.}3$ m$^2,$ b $=47\mathrm{.}6$ m$,$ Cp $=0\mathrm{.}019,$ e$=0\mathrm{.}92$