Question

'Amit' alone can do some work in 15 days. 'Bunty' is 40% more efficient than 'Amit'. 'Amit' worked alone for 4 days and left. How much time (in days) does 'Bunty' need to finish the remaining work?

A 9(2/7)
B 7(2/7)
C 7(6/7)
D 9(3/7)
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