1.

Two taps P and Q can fill a tank in 24 hours and 18 hours respectively. If the two taps are opened at 11 a.m., then at what time (in p.m.) should the tap P be closed to completely fill the tank at exactly 2 a.m?1). 52). 23). 34). 4

Answer»

Let the CAPACITY of the tank = 72 litres

Efficiency of pipe P = 72/24 = 3 litres/hour

Efficiency of pipe Q = 72/18 = 4 litres/hour

According to the question,

Total time in which tank has filled = 15 hours

Let the pipe P was closed at after n hours

According to the question

⇒ 3 × (n) + 4 × 15 = 72

⇒ 3n + 60 = 72

⇒ 3n = 12

⇒ n = 4

So, 4 hours after 11:00 am. that MEANS 3:00 PM

∴ the tap P should be closed at 3 : 00 pm



Discussion

No Comment Found

Related InterviewSolutions