A car of the transportation company transports a batch of materials from A to B. The original plan is to travel 75 kilometers per hour and arrive in 4 hours. Now the situation has changed. If the speed is increased by 20%, how many hours can it be reached? (Answer with proportional knowledge)
运输公司的一辆汽车从甲地往乙地运送一批物资，原计划每小时行75千米，4小时到达．现在情况有所变化，如果提速20%，几小时能到达？(用比例知识解答)
<gadget id="calculator">75 * 4</gadget>
<output>300</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">75 * (1/5)</gadget>
<output>15</output>

<gadget id="calculator">75 + 15</gadget>
<output>90</output>

<gadget id="calculator">300 / 90</gadget>
<output>10/3 = around 3.333333</output>

<result>10/3 = around 3.333333</result>