Question
Pipe ‘A’ and pipe ‘B’ can fill a cistern in 20
minutes and 10 minutes respectively. Pipe ‘C’ alone can empty the cistern in 12 minutes. If all three pipes are opened together then what is the time taken to fill 50% of the cistern?Solution
Let the capacity of the cistern = 60 units Then, efficiency of pipe ‘A’ = 60/20 = 3 units/minute Efficiency of pipe ‘B’ = 60/10 = 6 units/minute Efficiency of pipe ‘C’ = 60/12 = 5 units/minute So, combined efficiency of pipes ‘A’, ‘B’ and ‘C’ = 3 + 6 – 5 = 4 units/minute 50% of the cistern’s capacity = 30 units Therefore, time taken by all 3 pipes together to fill 50% of the cistern = 30/4 = 7.5 minutes
Select the set in which the numbers are related in the same way as are the numbers of the given set. (NOTE: Operations should be performed on the whole ...
i) Who is sitting in the second place on the left side of the Dani, Chintu is sitting at the fourth place on the right side.
ii) There are three ...
In a row of students, the position of Vineeta from the left side of the row is 26th and the position of Vineeta from the right side of the row is 23rd. ...
Select the option that is related to the fifth term in the same way as the second term is related to the first term and the fourth term is related to th...
Which of the following numbers will replace the question mark (?) in the given series?
8, 18, 38, 78, 158, ?
Eight people M, N, P, S, T, V, X and Y are sitting in a straight row and all are facing north. M sits second from one of the extreme ends of the row. On...
Which figure should replace the question mark (?) if the following series were to be continued?
Two statements are given, followed by three conclusions. Assuming the statements to be true, even if they seem to be at variance with commonly known fac...
18 is related to 54 following a certain logic. Following the same logic, 21 is related to 63. To which of the following is 72 related to, following the ...
Find the odd one out :
Axe, Dagger, Arrow, Knife
Relevant for Exams:
