Думаю...
переведём минуты в часы <span>210 минут-3 часа 30 минут.
21.30+3.30=1 час ночи.
Ответ: Поезд выехал в час ночи </span>
<em>Пусть х - стоимость 1 кг яблок,</em>
<em>а у - стоимость 1 кг груш.</em>
<em>х + у = 275; => х = 275 - у</em>
<em>4у - 3х = 50</em>
<em>4у - 3 · (275 - у) = 50</em>
<em>4у - 825 + 3у = 50</em>
<em>7у = 50 + 825</em>
<em>7у = 875</em>
<em>у = 875 : 7</em>
<em>у = 125 (тг) - стоит 1 кг груш.</em>
<em>275 - 125 = 150 (тг) - стоит 1 кг яблок.</em>
<em>Ответ: груши стоят - 125 тг, яблоки - 150 тг.</em>
<span><span><span>6 × 1 = 6</span><span>6 × 2 = 12</span><span>6 × 3 = 18</span><span>6 × 4 = 24</span><span>6 × 5 = 30</span><span>6 × 6 = 36</span><span>6 × 7 = 42</span><span>6 × 8 = 48</span><span>6 × 9 = 54</span><span>6 × 10 = 60</span></span><span><span>7 × 1 = 7</span><span>7 × 2 = 14</span><span>7 × 3 = 21</span><span>7 × 4 = 28</span><span>7 × 5 = 35</span><span>7 × 6 = 42</span><span>7 × 7 = 49</span><span>7 × 8 = 56</span><span>7 × 9 = 63</span><span>7 × 10 = 70</span></span><span><span>8 × 1 = 8</span><span>8 × 2 = 16</span><span>8 × 3 = 24</span><span>8 × 4 = 32</span><span>8 × 5 = 40</span><span>8 × 6 = 48</span><span>8 × 7 = 56</span><span>8 × 8 = 64</span><span>8 × 9 = 72</span><span>8 × 10 = 80</span></span><span><span>9 × 1 = 9</span><span>9 × 2 = 18</span><span>9 × 3 = 27</span><span>9 × 4 = 36</span><span>9 × 5 = 45</span><span>9 × 6 = 54</span><span>9 × 7 = 63</span><span>9 × 8 = 72</span><span>9 × 9 = 81</span><span>9 × 10 = 90</span></span><span><span>10 × 1 = 10</span><span>10 × 2 = 20</span><span>10 × 3 = 30</span><span>10 × 4 = 40</span><span>10 × 5 = 50</span><span>10 × 6 = 60</span><span>10 × 7 = 70</span><span>10 × 8 = 80</span><span>10 × 9 = 90</span><span>10 × 10 = 100</span></span></span><span><span><span>1 × 1 = 1</span><span>1 × 2 = 2</span><span>1 × 3 = 3</span><span>1 × 4 = 4</span><span>1 × 5 = 5</span><span>1 × 6 = 6</span><span>1 × 7 = 7</span><span>1 × 8 = 8</span><span>1 × 9 = 9</span><span>1 × 10 = 10</span></span><span><span>2 × 1 = 2</span><span>2 × 2 = 4</span><span>2 × 3 = 6</span><span>2 × 4 = 8</span><span>2 × 5 = 10</span><span>2 × 6 = 12</span><span>2 × 7 = 14</span><span>2 × 8 = 16</span><span>2 × 9 = 18</span><span>2 × 10 = 20</span></span><span><span>3 × 1 = 3</span><span>3 × 2 = 6</span><span>3 × 3 = 9</span><span>3 × 4 = 12</span><span>3 × 5 = 15</span><span>3 × 6 = 18</span><span>3 × 7 = 21</span><span>3 × 8 = 24</span><span>3 × 9 = 27</span><span>3 × 10 = 30</span></span><span><span>4 × 1 = 4</span><span>4 × 2 = 8</span><span>4 × 3 = 12</span><span>4 × 4 = 16</span><span>4 × 5 = 20</span><span>4 × 6 = 24</span><span>4 × 7 = 28</span><span>4 × 8 = 32</span><span>4 × 9 = 36</span><span>4 × 10 = 40</span></span><span><span>5 × 1 = 5</span><span>5 × 2 = 10</span><span>5 × 3 = 15</span><span>5 × 4 = 20</span><span>5 × 5 = 25</span><span>5 × 6 = 30</span><span>5 × 7 = 35</span><span>5 × 8 = 40</span><span>5 × 9 = 45</span><span>5 × 10 = <span>50
</span></span></span></span><span><span><span>11 × 1 = 11</span><span>11 × 2 = 22</span><span>11 × 3 = 33</span><span>11 × 4 = 44</span><span>11 × 5 = 55</span><span>11 × 6 = 66</span><span>11 × 7 = 77</span><span>11 × 8 = 88</span><span>11 × 9 = 99</span><span>11 × 10 = 110</span></span><span><span>12 × 1 = 12</span><span>12 × 2 = 24</span><span>12 × 3 = 36</span><span>12 × 4 = 48</span><span>12 × 5 = 60</span><span>12 × 6 = 72</span><span>12 × 7 = 84</span><span>12 × 8 = 96</span><span>12 × 9 = 108</span><span>12 × 10 = <span>120</span></span></span></span>
От деревни до города - 3,2 ч 52,5 км/ч
обратно - 3,5 ч ?км/ч
1) 52,5х3,2=168 (км) - расстояние от деревни до города
2) 168:3,5=48 (км/ч)
Ответ: со скоростью 48 км/ч ехал автомобиль из города до деревни.