Quantitative Aptitude Time and Work Work Efficiency

Mia and Ria can do a piece of a work alone in 15 days and 10 days respectively. Mia started the work alone and then after 5 days Ria joined her till the completion of the work. How long did the work last?

1

5 days

2

9 days

3

12 days

4

4 days

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