The bus and the truck set off at the same time from places A and B, which are 980 kilometers apart, and head toward each other. After 3 o'clock, the bus traveled the entire distance (12/49), and the truck traveled the entire distance (9/49). At this speed, how long will it take for the two cars to meet each other?
客车和货车从相距980千米的甲、乙两地同时出发，相向而行.3时后，客车行了全程的(12/49)，货车行了全程的(9/49)．照这样的速度，再过多长时间两车能相遇？
<gadget id="calculator">12 / 49</gadget>
<output>12/49 = around 0.244898</output>

<gadget id="calculator">(12/49) / 3</gadget>
<output>4/49 = around 0.081633</output>

<gadget id="calculator">980 * (4/49)</gadget>
<output>80</output>

<gadget id="calculator">9 / 49</gadget>
<output>9/49 = around 0.183673</output>

<gadget id="calculator">(9/49) / 3</gadget>
<output>3/49 = around 0.061224</output>

<gadget id="calculator">980 * (3/49)</gadget>
<output>60</output>

<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">980 / 140</gadget>
<output>7</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<result>4</result>