The passenger car and the truck start from A and B at the same time and go towards each other. The speed of the passenger car is 60 km/h, and the speed of the truck is (3/4) that of the passenger car. After 4 hours of departure, the distance between the two cars is 4 km. How many kilometers are there between A and B?
客车与货车从A、B两地同时出发，相向而行，客车的速度是60千米/小时，货车的速度是客车的(3/4)，出发4小时后，两车相距4千米，A、B两地相距多少千米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">60 * (3/4)</gadget>
<output>45</output>

<gadget id="calculator">60 + 45</gadget>
<output>105</output>

<gadget id="calculator">105 * 4</gadget>
<output>420</output>

<gadget id="calculator">420 + 4</gadget>
<output>424</output>

<result>424</result>