The students went on a spring outing and climbed the mountain. They walked 70 meters per minute up the mountain and 90 meters per minute down the mountain from the original road. If they take 16 minutes to go up and down the mountain without rest on the way, how many meters is the total length of this mountain road?
同学们春游爬山，上山每分钟走70米，从原路下山每分钟走90米．如果他们在途中不休息上下山一次用16分钟，这条山路全长多少米？
<gadget id="calculator">90 * 16</gadget>
<output>1_440</output>

<gadget id="calculator">70 + 90</gadget>
<output>160</output>

<gadget id="calculator">1_440 / 160</gadget>
<output>9</output>

<gadget id="calculator">9 * 70</gadget>
<output>630</output>

<result>630</result>