The distance between A and B is 840km. Master Zhang drove from A to B at 6:00 in the morning and traveled 180km in 3 hours. At this speed, when will Master Zhang reach point B?
A、B两地相距840km，早上6：00张师傅驾车从A地出发到B地，3小时行了180km．照这样的速度，张师傅什么时间能到达B地？
<gadget id="calculator">180 / 3</gadget>
<output>60</output>

<gadget id="calculator">840 / 60</gadget>
<output>14</output>

<gadget id="calculator">14 + 6</gadget>
<output>20</output>

<result>20</result>