Among the traffic lights in the east-west direction of the intersection, the ratio of the time when the green light, yellow light, and red light are on is 6:1:3, so how many hours in a day are the red lights in the east-west direction.
十字路口东西方向的交通指示灯中，绿灯、黄灯、红灯亮的时间之比为6：1：3，则一天中东西方向亮红灯的时间共多少小时．
<gadget id="calculator">6 + 1 + 3</gadget>
<output>10</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">24 * (3/10)</gadget>
<output>36/5 = around 7.2</output>

<result>36/5 = around 7.2</result>