Grandpa Wang did a morning exercise. He walked 72 meters per minute from home to the park and arrived in 8 minutes. He returned home from the park in 9 minutes. How many meters per minute did he walk on average when he returned?
王爷爷晨练，从家走到公园，每分钟走72米，8分钟到达，从公园返回家用了9分钟，返回时平均每分钟走多少米？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">72 * (8/9)</gadget>
<output>64</output>

<result>64</result>