Both father and mother set off from home at the same time to go shopping in a shopping mall 2,400 meters away from home. Dad walked 80 meters per minute, and mother walked 70 meters per minute. As soon as the father arrived at the entrance of the mall, he remembered that he had forgotten to bring money and returned immediately. meet. How many minutes did the mother leave at this time?
爸爸和妈妈两人同时从家里出发到离家2400米的商场去购物，爸爸每分钟行80米，妈妈每分钟行70米，爸爸刚到商场门口想起了忘带钱，立即返回，途中与妈妈相遇．问此时妈妈走了多少分钟？
<gadget id="calculator">80 + 70</gadget>
<output>150</output>

<gadget id="calculator">2 / 150</gadget>
<output>1/75 = around 0.013333</output>

<gadget id="calculator">2_400 * (1/75)</gadget>
<output>32</output>

<result>32</result>