It takes Xiao Ming 30 seconds to go from the first floor to the third floor. If he uses the same speed to go to the eighth floor, how much more time will he need?
小明从一楼到三楼要用30秒，请问如果他用同样的速度再到八楼，还需要多少
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<result>75</result>