It takes (3/40) hours on average for an automobile factory to produce a car this year, which is (1/120) hours shorter than last year. How many hours did it take on average to produce a car last year?
一个汽车制造厂今年生产一辆汽车平均用(3/40)小时，比去年缩短(1/120)小时，去年生产一辆汽车平均用多少小时？
<gadget id="calculator">3 / 40</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">1 / 120</gadget>
<output>1/120 = around 0.008333</output>

<gadget id="calculator">(3/40) + (1/120)</gadget>
<output>1/12 = around 0.083333</output>

<result>1/12 = around 0.083333</result>