Question

"Akash and Bittu can individually complete a task in 40 days and 50 days, respectively. They start working together, and after 10 days, Chinky joins them. The work is finished in a total of 20 days. How many days would Chinky take to complete the same task alone?"

A 100 days
B 90 days
C 120 days
D 140 days
E None of these
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