Question
A tank has three pipes, X, Y, and Z. X can fill the tank
in 8 hours, Y can fill it in 12 hours, and Z can empty it in 6 hours. If X, Y, and Z are opened together, how long will it take to fill the tank?Solution
Work done by X in 1 hour = 1/8 Work done by Y in 1 hour = 1/12 Work done by Z in 1 hour (emptying) = -1/6 Net work in 1 hour = (1/8) + (1/12) - (1/6) Taking LCM of 8, 12, and 6 = 24, Net work = (3/24) + (2/24) - (4/24) = 1/24 The tank will be filled in 24 hours.
Select the correct indirect form of the given sentence.
She said, “I am in no mood to work now.”
Select the most appropriate indirect form of the given sentence.
The professor said to Piyush, “Will you clean the data and get back to me to...
The teacher advised me that I should practice as much as I can if I wanted to score 100% marks in Mathematics.
The teacher said to me, "Stand here next to the podium."
The saint prayed that God might pour all his blessings on the newly married couple.
Select the most appropriate direct form of the given sentence.
Anurag says that he would like to be an electronics engineer when he grows up.
Choose the option that is the indirect form of the sentence.
“Please bring me a cup of coffee,” Shakila said to the waiter.
Select the correct indirect form of the given sentence.
The commander said to the soldiers, “Don’t think twice. Jump off the plane now.”
Select the correct direct form of the given sentence.
The air hostess said that the passengers must wear face masks during the flight.
The police asked the thief whether he has killed the tourists.
Relevant for Exams:
