school has 50 students to participate in picking activities in the suburbs 22.5 kilometers away from the school. The school only has a medium-sized van with a capacity of 25 people. In order to let all the students reach the destination as soon as possible, it is decided to take a combination of walking and riding. ． It is known that the walking speed of a student is 5 kilometers per hour, and the speed of a car is 60 kilometers per hour. Please design a plan, how many hours is the shortest time for all students to reach their destination?
某校有50名学生到离学校22.5千米的郊区参加采摘活动，学校只有一辆限乘25人的中型面包车，为了让全体学生尽快地到达目的地，决定采取步行与乘车相结合的办法．已知学生步行的速度是每小时5千米，汽车行驶的速度是每小时60千米．请你设计一个方案，使全体学生都能到达目的地的最短时间是多少小时？
<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">11 / 2</gadget>
<output>11/2 = around 5.5</output>

<gadget id="calculator">1 + (11/2)</gadget>
<output>13/2 = around 6.5</output>

<gadget id="calculator">1 + (13/2)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">22.5 / (15/2)</gadget>
<output>3</output>

<gadget id="calculator">(13/2) / 60</gadget>
<output>13/120 = around 0.108333</output>

<gadget id="calculator">3 * (13/120)</gadget>
<output>13/40 = around 0.325</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(13/40) + (3/5)</gadget>
<output>37/40 = around 0.925</output>

<result>37/40 = around 0.925</result>