Xiao Ming and his mother set off from home at the same time to watch a movie at a cinema 810 kilometers away from home. Xiao Ming was impatient and ran to the cinema at a speed of 54 meters per minute. He found that the ticket was still in his mother's hand, so he returned at the same speed and met his mother on the road 5 minutes later. Question: How many meters does mother walk per minute?
小明与妈妈同时从家出发去距家810千米的电影院看电影．小明心急，先以每分钟54米的速度跑到电影院，发现票还在妈妈手上，所以马上以原速返回，又在5分钟后与妈妈在路上相遇．问：妈妈每分钟走多少米？
<gadget id="calculator">810 * 2</gadget>
<output>1_620</output>

<gadget id="calculator">810 / 54</gadget>
<output>15</output>

<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<gadget id="calculator">1_620 / 20</gadget>
<output>81</output>

<gadget id="calculator">81 - 54</gadget>
<output>27</output>

<result>27</result>