A car drives from place A to place B. After driving the whole distance (3/7), it is 15 kilometers less than the remaining distance. How many kilometers away from B at this time?
一辆汽车从甲地开往乙地，行驶了全程的(3/7)后，比剩下的路程少15千米．这时距乙地还有多少千米？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">15 / (1/7)</gadget>
<output>105</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">105 * (4/7)</gadget>
<output>60</output>

<result>60</result>