An air conditioner can cool the hall in 40 miutes while another takes 45 minutes to cool under similar conditions. If both air conditioners are switched on at same instance then how long will it take to cool the room approximately ?
A) 18 minutes B) 19 minutes
C) 22 minutes D) 24 minutes
Air conditioner can cool the hall in 40 minutes
Answer: C) 22 minutes
Let the two conditioners be A and B
‘A’ cools at 40min
‘B’ at 45min
Together = (a x b)/(a + b)
= (45 x 40)/(45 + 40)
= 45 x 40/85
= 22 min (approx).
Subject: Time and Work – Quantitative Aptitude – Arithmetic Ability
Exam Prep: GRE , GATE , CAT , Bank Exams , AIEEE
Job Role: Bank PO , Bank Clerk