Question
Pipes 'P' and 'Q' can fill a tank in 36 minutes and 72
minutes respectively. A third pipe 'R' can empty it in 1 hour 48 minutes. 'P' and 'R' are turned on together. After 30 minutes, 'Q' is also started. Find how long in total it takes to fill the tank.Solution
ATQ,
Let the capacity of tank be 432 litres (LCM of 36, 72 and 108)
Efficiency of 'P' = 432 ÷ 36 = 12 litres/minute
Efficiency of 'Q' = 432 ÷ 72 = 6 litres/minute
Efficiency of 'R' = 432 ÷ 108 = -4 litres/minute
Filled in 30 minutes = (12 - 4) × 30 = 240 litres
Remaining = 432 - 240 = 192 litres
Time for remaining = 192 ÷ (12 + 6 - 4) = 16 minutes
Total time = 30 + 16 = 46 minutes
The value of
Which one of the following elements is not naturally found in human beings?
Which of the following grants/grant direct credit assistance to rural households?
1) Regional Rural Banks
2) National Bank for Agricul...
Which of the following statements are correct regarding PMJDY?
I. The scheme provides for opening a bank acc...
Which of the following numbers will replace the question mark (?) in the given series?
3, 7, 13, 21, 31, ?
Which of the following is the oldest river valley project in Bihar ?
The journal entry for the purchase of inventory on credit would be:
On which date is National Science Day observed in India?
In which state “Amangarh Tiger Reserve” located where mutilated carcass of an adult leopard was recently found in the ?
A storeroom has only steel and copper rods in the ratio 5:6, respectively and the weight of each steel and each copper rod is in the ratio 4:7, respecti...
Relevant for Exams:
