small airplane flies at a speed of 320 km/h in still air. Now there is wind, the wind speed is 40 km/h (the wind speed remains constant), the whole flight takes 135 minutes against the wind, how many minutes does it take to return with the wind. (Takeoff and landing times are omitted)
一架小飞机，在静止的空气中飞行速度为320千米/小时．现在有风，风速为40千米/小时(风速不变)，逆风飞行全程需时135分钟，顺风返回需时多少分钟．(飞机起飞和着陆的时间略去不计)
<gadget id="calculator">320 - 40</gadget>
<output>280</output>

<gadget id="calculator">320 + 40</gadget>
<output>360</output>

<gadget id="calculator">135 / 360</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">280 * (3/8)</gadget>
<output>105</output>

<result>105</result>