Mathematics · Time and Work
P and Q together can complete a piece of work in 10 days. Q and R together can complete the same work in 15 days. If P, Q, and R all work together, the work is completed in 7.5 days. How many days will P and R together take to complete the same work?
- 15 days
- 215 days
- 310 days✓
- 47 days
Correct answer
10 days
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