1) 64+(64+9)=137(км/ч) - общая скорость
2)137
× 19
____
2133
137
____
3503(км) - расстояние
3(целых)<span>3/8</span> × 1(целых)<span>1/15</span> = <span>3 + 3·8/8</span> × <span>1 + 1·15/15</span> = <span>27/8</span> × <span>16/15</span> = <span>27·16/8·15</span> = <span>432/120</span> = <span><span>18·24/</span><span>5·24</span></span> = <span>18/5</span> = <span>3 + 3·55</span> = 3(целых)<span>3/5</span> = 3.6
18324÷36=59
59×4=236
18000-236=17764
17764+7840=25605