"A' ഒരു ജോലി 20 ദിവസം കൊണ്ടും "B' അതേ ജോലി 30 ദിവസം കൊണ്ടും ചെയ്തുതീർക്കും. A യും B യും ഒരുമിച്ച് ആ ജോലി ചെയ്യുകയാണെങ്കിൽ എത്ര ദിവസം കൊണ്ട് ജോലി പൂർത്തിയാകും?
A10
B12
C20
D25
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