Lan Lan's home is 1.9 kilometers away from the school. When she went to school in the morning, she walked 0.5 kilometers away from home and then returned home to pick up the pencil case. How many kilometers did he walk more than usual this time?
兰兰家离学校1.9千米．早晨上学时，她走到离家0.5千米处又返回家拿文具盒，这次他比平时要多走多少千米？
<gadget id="calculator">0.5 + 0.5</gadget>
<output>1</output>

<result>1</result>