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P യും Q വും ചേർന്ന് 12 ദിവസം കൊണ്ട് ഒരു ജോലി ചെയ്യാൻ കഴിയും, P ക്ക് മാത്രം 15 ദിവസം കൊണ്ട് ചെയ്യാൻ കഴിയും. Q മാത്രം എത്ര ദിവസത്തിനുള്ളിൽ അത് ചെയ്യാൻ കഴിയും?

A360

B36

C60

D120

Answer:

C. 60

Read Explanation:

ആകെ ജോലി = lcm (12,15) = 60 P+Q യുടെ കാര്യക്ഷമത = 60/12 = 5 P യുടെ കാര്യക്ഷമത = 60/15 = 4 Q യുടെ കാര്യക്ഷമത = 5 - 4 = 1 Q മാത്രം ജോലി ചെയ്യാൻ എടുക്കുന്ന സമയം = 60/1 = 60 ദിവസം


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