Question
A tank can be filled by two pipes, A and B, in 15
minutes and 20 minutes, respectively. Both pipes are opened together, but after 5 minutes, pipe A is closed. How much total time will it take to fill the tank?Solution
Work done by A and B in 1 minute = 1/15 + 1/20 = (4 + 3) / 60 = 7/60. Work done by A and B in 5 minutes = 5 × 7/60 = 35/60 = 7/12. Remaining work = 1 - 7/12 = 5/12. After A is closed, only B is working. Time taken by B to complete the remaining work = (5/12) ÷ (1/20) = (5/12) × 20 = 100/12 = 8.33 minutes. Total time = 5 minutes + 8.33 minutes ≈ 13.33 minutes .
'Satyameva Jayate' means
In which state is the Nandi Award for the best choreographer presented every year?
With which of the following anchor banks were Oriental Bank of Commerce and United Bank of India merged?
The Credit Guarantee Scheme for Subordinate Debt (CGSSD) scheme which was only valid till 31st March 2021 has now extended for_____?
P, Q, R, S, T and U are six friends. Which of the following is/are sufficient to compare heights of S and T?
1. R is shorter than P but taller...
What is the name of the portal that facilitates the automatic triggering of activities for pending tasks nearing the Turnaround Time and complaints regi...
Who has conferred the 56th Jnanpith Award for the year 2021, in April 2022?
In the 1939 Tripuri Congress Presidential Election, Pattabhi Sitaramayya was defeated by:
The marginal propensity to consume (MPC) refers to the:
What is the percentage of GST charged on hotel rooms?
Relevant for Exams:
