Xiaosheng and Xiaomu go swimming in the swimming pool. They set off from the left bank and the right bank of the swimming pool at the same time, and swim towards each other. When they met for the first time, they were 40 meters away from the left bank of the swimming pool, and when they met for the second time, they were 20 meters away from the right bank of the swimming pool. , how many meters is the distance between the left and right banks of this swimming pool?
小生和小慕两个人到游泳池去游泳，两人分别从游泳池的左岸和右岸同时出发，相向而游，两人第一次相遇时距游泳池左岸40米，第二次相遇时距游泳池右岸20米，求这个游泳池左右两岸相距多少米？
<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<gadget id="calculator">120 - 20</gadget>
<output>100</output>

<result>100</result>