A rides a bicycle for 110 kilometers every day, B rides a bicycle for 60 kilometers on the first day, and every day thereafter travels 5 kilometers more than the previous day. The two set off at the same time, how many days will B catch up with A?
甲骑车每天行110千米，乙骑车第一天行60千米，以后每天都比前一天多行5千米．两人同时出发，第几天乙追上甲？
<gadget id="calculator">220 - 115</gadget>
<output>105</output>

<gadget id="calculator">105 / 5</gadget>
<output>21</output>

<result>21</result>