car travels at 40 km/h on a normal road and 90 km/h on a highway. How many kilometers has the car traveled on ordinary roads and expressways for 3 hours each?
一辆汽车在普通公路的速度是40千米/时，在高速公路的速度是90千米/时．这辆汽车在普通公路和高速公路各行了3小时，一共行多少千米？
<gadget id="calculator">40 + 90</gadget>
<output>130</output>

<gadget id="calculator">130 * 3</gadget>
<output>390</output>

<result>390</result>