car travels on a plain and a mountain for 3 hours before arriving at its destination. It is known that the speed of the car on the plain is 80 km/h and the speed on the mountain is 45 km/h. How long is the distance traveled by the car? rice?
一辆汽车在平原和山区各行了3小时才到达目的地，已知汽车在平原的速度是80千米/时，在山区的速度是45千米/时，汽车行驶的这段路长多少千米？
<gadget id="calculator">80 + 45</gadget>
<output>125</output>

<gadget id="calculator">125 * 3</gadget>
<output>375</output>

<result>375</result>