truck and a bus depart from places A and B respectively at the same time. Traveling towards each other, the two cars meet and continue to move forward. When the distance between the two cars is 90 kilometers, the passenger car has traveled 3/5 of the whole journey, and the truck has traveled 70% of the whole journey. At this time, the truck has traveled for 3 hours. How long will it take for the bus to arrive at A?
货车和客车分别从甲、乙两地同时开出．相向而行，两车相遇后，继续前进，当两车相距90千米时，客车走了全程的(3/5)，货车走了全程的70%，此时，货车行了3小时，问客车还要多少时间才能到达甲地．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/10) - 1</gadget>
<output>-3/10 = around -0.3</output>

<gadget id="calculator">(3/5) + (-3/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">90 / (3/10)</gadget>
<output>300</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(7/10) / 3</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">300 * (7/30)</gadget>
<output>70</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">70 * (6/7)</gadget>
<output>60</output>

<gadget id="calculator">(2/5) / 60</gadget>
<output>1/150 = around 0.006667</output>

<gadget id="calculator">300 * (1/150)</gadget>
<output>2</output>

<result>2</result>