'A' alone can do a piece of work in 10 days and 'B' alone in 15 days. 'A' and 'B' undertook to do it for Rs. 42,000. With the help of 'C', they completed the work in 5 days. How much (in Rs.) is to be paid to 'B'?

1
14,000
2
15,000
3
21,000
4
7,000

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