Quantitative Aptitude Time and Work Work Efficiency

Rahul can complete his work in 7 days and Raj can complete the work in 4 days. How many total days will they take to complete the work together? 

1
\(\frac{28}{11}\) days
2
\(\frac{14}{11}\) days
3
\(\frac{28}{13}\) days
4
\(\frac{15}{11}\) days

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