A car drives from point a to point b. The ratio of uphill, flat and downhill distances is 1:2:3, and the ratio of time spent uphill, flat and downhill is 4:5:6. It is known that the speed of the car going uphill is 3 kilometers per hour, and the whole journey is 50 kilometers. Find the time it takes to go uphill.
一辆汽车从a地开往b地，上坡、平地、下坡的路程比是1：2：3，上坡、平地、下坡所用的时间比是4：5：6．已知汽车上坡的速度为3千米每小时，全程为50千米．求上坡所用的时间．
<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

<gadget id="calculator">50 / 6</gadget>
<output>25/3 = around 8.333333</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(25/3) * (1/3)</gadget>
<output>25/9 = around 2.777778</output>

<result>25/9 = around 2.777778</result>