Question

'Aman' and 'Bhanu' together can complete a work in 7.2 days. Both of them started the work but 'Bhanu' left the work after 3 days and remaining work was completed by 'Aman' alone in 7 days. Efficiency of 'Charu' is 50% more than the efficiency of 'Bhanu'. Find the time taken by 'Charu' to complete 80% of the work 

A 12.5 days
B 9.6 days
C 18.5 days
D 21.3 days
E None of these
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