It is about 1.5 kilometers from Xiaohong's house to the school. She goes back and forth twice a day. How many kilometers does she walk in a week (calculated on the basis of 5 days).
小红家到学校大约1.5千米，她每天往返两次，她一周(按5天计算)大约走多少千米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">1.5 * 4 * 5</gadget>
<output>30</output>

<result>30</result>