Пусть скорость <span> пешехода</span> - Х км/ч, тогда скорость <span>всадник</span>а - ( Х+12) км/ч.
Скорость сближения <span> пешехода</span> и <span>всадник</span>а - Х + ( Х+12) = 2Х + 12 км/ч.
<span>Они встретились через 5 мин= 5/60 ч = 1/12 ч</span>
<span>Зная что <span>расстояние между <span>пункт</span>ами 2 км, составим уравнение:</span></span>
<span><span>(2Х + 12 ) * <span>1/12</span> = 2</span></span>
<span><span><span><span>2Х<span><span> * <span>1/12</span></span></span> + <span><span>12 * <span>1/12</span> = 2</span></span></span></span></span></span>
<span><span><span><span><span><span><span><span><span><span>Х<span><span><span>/6</span></span></span> + <span><span>1 = 2</span></span></span></span></span></span></span></span></span></span></span></span>
<span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span>Х<span><span><span>/6</span></span></span> <span><span> = 1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span>Х = 6 ( км/ч - скорость <span> пешехода</span>)</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span> Х+12 = 6+12 = 18 (км/ч) - скорость <span>всадник</span>а </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span>Ответ: <span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span> 6 км/ч - скорость <span> пешехода</span>, <span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span>18 км/ч - скорость <span>всадник</span>а.</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
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