Xiaomin's house is 90 meters away from the school. If he goes back and forth twice a day and goes to school for a week (5 days), how many meters will he have to walk in total?
小民家离学校90米，如果每天往返两次，上学一个星期(5天)，一共要走多少米．
<gadget id="calculator">90 * 2 * 2 * 5</gadget>
<output>1_800</output>

<result>1_800</result>