A car travels from point A to point B at a speed of 45 kilometers per hour, and travels the entire distance (5/7) in 3 hours. How many kilometers does this car have to drive to reach point B?
一辆汽车以每小时45千米的速度从甲地到乙地，3小时行了全程的(5/7)，这辆汽车还要行多少千米才能到达乙地？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">3 / (5/7)</gadget>
<output>21/5 = around 4.2</output>

<gadget id="calculator">45 * (21/5)</gadget>
<output>189</output>

<gadget id="calculator">45 * 3</gadget>
<output>135</output>

<gadget id="calculator">189 - 135</gadget>
<output>54</output>

<result>54</result>