Master Zhang drove to a certain place. At the starting point, he saw the two-digit △□km written on the milestone on the roadside. After an hour, he saw the △△km written on the second milestone. After another hour, The third milestone is written with three digits, which happens to be the middle of the first two digits plus a 0, that is, △0□km. If the speed of the car remains constant, what is the number of kilometers displayed on the third milestone.
张师傅开车去某地，在起点处他看见路边里程碑上写着两位数△□千米，过了一小时，他看见第二里程碑上写着□△千米，又过了一小时，第三个里程碑上写着三位数，恰好是第一个两位数的中间加个0，即△0□千米．如果汽车的速度始终不变，第三个里程碑上显示的数是多少千米．
<result>106</result>