A car drives from place A to place B at a speed of 45 kilometers per hour, and it just reaches the midpoint of the two places in (3/4). Find the length of the road between A and B in kilometers.
一辆汽车以每时45千米的速度从甲地驶往乙地，(3/4)时正好走到两地的中点处，求甲、乙两地之间公路长多少千米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">45 * (3/4) * 2</gadget>
<output>135/2 = around 67.5</output>

<result>135/2 = around 67.5</result>