其它
Colin was preparing for the PE test. On the first day, he ran $1$ km. He decided that each day he would be running $100$ m more than the day before. How many meters did he run in total in the first $5$ days? 
Overseas Competition->Knowledge Point->Word Problem Modules->Practical Application of Arithmetic Progression
$1000 + 1100 + 1200 + 1300 + 1400 = 6000$ 