A,B യുടെ ഇരട്ടി വേഗത്തിൽ ജോലി ചെയ്യും. B 36 ദിവസം കൊണ്ട് ജോലി ചെയ്തു തീർക്കും എങ്കിൽ രണ്ടു പേരും കൂടി എത്ര ദിവസം കൊണ്ട് ആ ജോലി ചെയ്തു തീർക്കും?
A20
B15
C12
D10
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