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Must Waste More Time...
x*t км,
по формуле: V=S/t, где V - скорость, S - путь, t - время,
следовательно S=V*t, по условию задачи это x*t
мотоциклисту потребовалось времени до встречи t мот= d/y,
где по условию задачи d - путь мотоциклиста до встречи, а у - скорость
смотри формулу V=S/t => t+S/V
Общее расстояние между пунктами M и N складывается из трех частей:
путь автомобиля до момента движения мотоциклиста, он нам известен x*t
путь мотоциклиста до встречи, по условию это d
путь автомобиля от момента движения мотоциклиста до встречи с ним, он нам не известен, но может быть вычислен по формуле s=V*T,
где V это скорость автомобиля, по условию - x
T - это время движения автомобиля до встречи, оно равно времени движения мотоциклиста. Мы его вычислили t мот=d/y,
т.о. неизвестный отрезок пути равен s=x*d/y
общее расстояние между пунктами равно
S(MN)=x*t+x*d/y+d