Xiao Ming spent 0.15 hours doing math homework and 0.6 hours doing Chinese homework. How many hours did it take him to complete these two homeworks?
小明做数学作业用去0.15小时，做语文作业用去了0.6小时，他完成这两项作业共用了多少小时？
<gadget id="calculator">0.15 + 0.6</gadget>
<output>0.75</output>

<result>0.75</result>