Question
Pipes 'X' and 'Y' together can fill a tank in 30
minutes, while Pipe 'X' alone can fill the tank in 50 minutes. Another pipe 'Z' can empty the fully filled tank in 100 minutes. Find the time taken by pipes 'Y' and 'Z' together to fill 60% of the same tank.Solution
Let the total capacity of the tank be 150 litres (LCM of 30, 50, and 100). Combined efficiency of 'X' and 'Y' = (150 / 30) = 5 litres/minute. Efficiency of 'X' = (150 / 50) = 3 litres/minute. So, efficiency of 'Y' = 5 - 3 = 2 litres/minute. Efficiency of 'Z' = (150 / 100) = -1.5 litres/minute (negative sign shows outlet pipe). Capacity of tank to be filled = 0.6 × 150 = 90 litres. So, required time = 90 ÷ (2 - 1.5) = 90 ÷ 0.5 = 180 minutes.
[24/7] is related to [12/7] following a certain logic. Following the same logic, [11/15] is related to [11/30]. To which of the following is [9/13] rela...
Which of the following numbers will replace the question mark (?) in the given series?
134, 129, 122, ?, 102, 89
If A denotes ‘+’, B denotes ‘×’, C denotes ‘−’, and D denotes ‘÷’, then what will come in place of ‘?’ in the following equation...
If all the letters in the word ‘RESPECTIVE’ are arranged in alphabetical order from left to right such that the vowels are arranged first followed b...
In the following number-pairs, the second number is obtained by applying certain mathematical operations to the first number. Select the set in which th...
Select the fourth, seventh, eleventh and thirteenth letters of the word 'CATEGORISATION to form meaningful word(s).
If only one word can be fo...
Three of the following four pairs of alphas and numerals have the same relationship between their elements as in the case of the pair PROBLEM : 2948375 ...
What should come in place of the question mark (?) in the given series based on the English alphabetical order?
KGU HCP EYK BUF YQA ?
Which of the following numbers will replace the question mark (?) in the given series?
29, 33, ?, 113, 369
Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the odd letter-cluster.
Relevant for Exams:
