Together, the three intake pipes, "P," "Q," and "R," can fill a water tank in eight hours. While the three pipes are opened simultaneously, pipe "Q" closes after three hours. Determine how long pipe "Q" took to fill the same tank by itself if pipes "P" and "R" completed the remaining portion in 9 hours.
ATQ, Let quantity filled by pipe ‘P’, ‘Q’ and ‘R’ together in 8 hrs = 1 litres Quantity filled by pipe ‘P’, ‘Q’ and ‘R’ together in 1 hrs = (1/8) litres Quantity filled by pipe ‘P’, ‘Q’ and ‘R’ together in 3 hrs = (3/8) litres Remaining quantity to be filled = {1 – (3/8)} = (5/8) litres Quantity filled by pipe ‘P’ and ‘R’ together in 9 hrs = (5/8) litres Quantity filled by pipe ‘P’ and ‘R’ together in 1 hrs = (5/72) litres Quantity filled by pipe ‘Q’ alone in 1 hour = (1/8) – (5/72) = (4/72) litres So, pipe ‘Q’ alone can fill the tank in (72/4) = 18 hrs
The height of a right circular cone is 35 cm and the area of its curved surface is four times the area of its base. What is the volume of the cone (in ...
A rectangular piece of copper foil of length 56 cm and area 616 cm2 is folded along its width to form a cylinder such that there is only one ...
If the curved surface area and the radius of a cylinder are 440 cm2 and 10 cm, respectively, then find the volume (in cm3) of the ...
Ashish and Sushil together start a business with investment of Rs. 1700 and Rs. ‘x + 1100’, respectively. If the profit earned after 5 years...
A storeroom has only steel and copper rods in the ratio 3:4, respectively and the weight of each steel and each copper rod is in the ratio 5:8, respecti...
Area of a rectangle is equal to the total surface area of a hemisphere having volume 8192 cm³. Find the perimeter of the rectangle if its length is 125...
A barrel has 140 liters of mixture of alcohol and water, in which water is 10%. 30 litre of this mixture was taken out and replaced with “X”...
The ratio of the length to the breadth of a rectangular park is 3:2. If a man cycling along the boundary of the park at the speed of 18 km/hr completes...
Sides of a parallelogram are in the ratio 5:4. Its area is 1200 sq. units. Altitude on the greater side is 24 units. Altitude on the smaller side is:
Area of a rhombus whose one of the diagonals (d1) is 28 cm, is 560 cm2. Each side of a square paper is 20 cm more than other diagonal (d2) of...