Scenic tourist pick-up cars go up the mountain from the foot of the mountain along the road at a speed of 25 kilometers per hour, and reach the top of the mountain in 14 minutes. When returning along the original road, the speed is 40% faster than when going up the mountain. How long did it take you to get from the top to the bottom of the mountain?
景区旅游接送车以25千米每小时的速度从山脚沿公路上山，14分钟到达山顶．沿原路返回时，速度比上山时快40%．下山时，从山顶到山脚用了多长时间？
<result>10</result>