Let time taken by third pipe to fill the tank = x hrs so time taken by 2nd pipe to fill the tank = x + 4 hrs & time taken by 1st pipe to fill the tank = x + 4 + 45 = x + 49 hrs; Hence 1/(x+4) +1/(x+49) = 1/x (x + 4 + x + 49)/ {(x + 4)(x + 49)} = 1/x (2x + 53)/(x2+ 53x + 196) = 1/x 2x2+ 53x = x2 + 53x + 196 x2 = 196 x = 14 hrs So time taken by 1st pipe to fill the tank = x + 49 = 14 + 49 = 63 hrs Alternate Method :- Let time taken by third pipe to fill the tank = x hrs so time taken by 2nd pipe to fill the tank = x + 4 hrs & time taken by 1st pipe to fill the tank = x + 4 + 45 = x + 49 hrs; Then x = root of (4 × 49) = root of 196 = 14 hrs So time taken by 1st pipe to fill the tank = x + 49 = 14 + 49 = 63 hrs.
NaCl has which kind of bonds?
Modern periodic table has ______ groups and ______ periods.
Which gas is produced due to incomplete combustion of fuel?
_________is a formula for rust.
Which of the following is not a natural polymer?
The conversion of hard water into soft water by boiling or adding calcium hydroxide is called:
Which gas is commonly used in electric bulbs to prevent oxidation?
Which drug is used as an anti-inflammatory?
A mixture of carbon monoxide and hydrogen is known as ______
Biofertilizers convert nitrogen to: