Two cars, A and B, go from A to B at the same time. The speed of A is 3/4 of that of B. If A travels in 12 hours, how many hours does it take for B to travel?
甲乙两车同时由A到B，甲的速度是乙的(3/4)，若甲行全程用12小时，乙车行全程用多少小时．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12 * (3/4)</gadget>
<output>9</output>

<result>9</result>