Question
Three pipes A, B, and C can fill a tank in 50 minutes,
60 minutes, and 75 minutes respectively. All are opened together. A is closed after 'n' minutes, and B is closed (2n - 6) minutes before the tank is filled. If the tank is filled in 40 minutes, find the value of 'n'.Solution
Let the total capacity of tank be 300 litres (LCM of 50, 60, 75)
Efficiency of A = 300 ÷ 50 = 6 litres/minute
Efficiency of B = 300 ÷ 60 = 5 litres/minute
Efficiency of C = 300 ÷ 75 = 4 litres/minute So,
(6 + 5 + 4) × n + (5 + 4) × (40 - n - (2n - 6)) + 4 × (2n - 6) = 300
Or, 15n + 9(46 - 3n) + 8n - 24 = 300
Or, 15n + 414 - 27n + 8n - 24 = 300
Or, -4n + 390 = 300
Or, n = 22.5 minutes
Which of the following test is used to test the goodness of fit?
Farming which is done in area receiving rainfall less then 750 mm annually
What led to India's self-sufficiency in cotton production in the mid-1970s?
Which one of the following stage present in meiotic cell division but not in mitotic cell Division?
Which of the following weed causes Dropsy disease in humans?
Cocconut contains how much percentage of oil?
A situation when the rainfall deficiency is 25% or more of long term average, it is classified as
Income elasticity for normal goods is:
Gundhi bug, a pest of rice attacks the plant in which stage?
The favorable conditions for Photorespiration are :
