Suggestion for Beginners: Do the entire Maths till you have final value of answer (to gain confidence)
Suggestion for GMAT Aspirants taking GMAT in 30 days: Avoid calculation in DS problems and use that time for other DI questions
Explanation for Aspirants planning to take exam in 30 days
Step-0: Understand what is to be calculated
Time = ???Step-1: Acknowledge and analyse what we have
Capacity of pool
√Step-2: Find out teh minimum required information to answer the question
Rates of Hoses P and T
X (Required)Step-3: Process the statements to check whether they provide what we require to answer the question
Statement 1: Hose T alone would take 4 hours and hose P would take half as long.
Se we have Rates of both Hoses P and T hence
SUFFICIENTStatement 2: Half of the pool was filled by 8 a.m.
We don't know at what time the hoses began filling the pool hence their combined rate is still indeterminable hence
NOT SUFFICIENTAnswer: Option A
---Bunuel wrote:
Hoses P and T simultaneously fill an empty swimming pool that has a capacity of 30,000 liters. If the flow in each hose is independent of the flow in the other hose, how many hours will it take to fill the pool?
(1) Hose T alone would take 4 hours and hose P would take half as long.
(2) Half of the pool was filled by 8 a.m.