Question

Working​ together, Sarah and Jeff can do a task in 6 hours. Jeff uses a motorized cart to do the​ task, whereas Sarah uses a pushcart. If each person does the task without the help of the​ other, it takes Sarah twice as long as it takes Jeff. How long does it take Sarah to complete the​ task?
see
http://www.jiskha.com/display.cgi?id=1487716112

this is very similar, except you would have
1/x and 1/2x as the combined rate, and you know that result.

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