Two people, A and B, set off from A and B respectively at the same time. After meeting each other, A continues to go to B, and B returns immediately and goes to B. A travels from A to B 0.5 hours later than B returns to B. It is known that the speed of A is (3/4) of B, how many hours does it take for A to get from A to B?
甲、乙两人分别从A、B两地同时相向出发，相遇后，甲继续向B地走，乙马上返回，往B地走．甲从A地到达B地，比乙返回B地迟0.5小时．已知甲的速度是乙的(3/4)，甲从A地到达B地共用多少小时？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">0.5 / (1/4)</gadget>
<output>2</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">2 / (4/7)</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>