A technician can assemble an instrument in 9.5 h. After working for $2.0 \mathrm{h},$ she is joined by another technician who, alone, could do the job in 7.5 h. How many additional hours are needed to finish the job?
Added by Luis C.
Step 1
The first technician can complete the job in 9.5 hours. Therefore, her work rate is \( \frac{1}{9.5} \) of the job per hour. The second technician can complete the job in 7.5 hours. Therefore, his work rate is \( \frac{1}{7.5} \) of the job per hour. Show more…
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