Xiaohong walks 16 kilometers in 4 hours. At this speed, how many kilometers does Xiaohong walk in 7 hours?
小红4小时走16千米，照这样的速度，小红7小时走多少千米．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 * 7</gadget>
<output>28</output>

<result>28</result>