It took Xiao Ming 30 seconds to walk from the 1st floor to the 3rd floor. If he uses the same speed to go to the 8th floor, how many seconds will it take to get there?
小明从1楼走到3楼用了30秒，如果他用同样的速度再到8楼，还需要多少秒才能到达．
<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>