Two horses, A and B, set off at the same time at a distance of 50 meters. At the start, horse A is in front and horse B is behind. If horse A runs 10 meters per second and horse B runs 12 meters per second, how many seconds will the distance between the two horses be 70 meters?
甲、乙两匹马在相距50米的地方同时出发，出发时甲马在前乙马在后．如果甲马每秒跑10米，乙马每秒跑12米，多少秒两马相距70米？
<gadget id="calculator">50 + 70</gadget>
<output>120</output>

<gadget id="calculator">12 - 10</gadget>
<output>2</output>

<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<result>60</result>