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Speed of train = 72 km/hr = 72 × (5/18) = 20 m / sec If the length of bridge be x metre, then ⇒ 20 = (275 + x)/45 ⇒ 275 + x = 900 ⇒ x = 900 – 275 = 625 metre
If the length of a rectangle is increased by 10% and its breadth is decreased by 5%, then the area of the rectangle will be increased or decreased by ho...
Three circle of diameter 14 cm each, are bound together by a rubber band, as shown in the figure. The length of the rubber band, in cm, if it is stretch...
Length and breadth of a rectangular field is (x + 7) cm and (x – 6) cm, respectively. If the cost of ploughing the field at a rate of Rs. 6 per cm² i...
The ratio of the curved surface area and the total surface area of a cylinder is 5:7, respectively. Find the ratio of the height and radius of the cylin...
A village having a population of 8000 requires 200 litres of water per head per day. It has a tank measuring 40 m `xx` 30 m `xx` 12 m. The water of this...
A solid cube of side 8 cm is dropped into a rectangular container of length 16 cm, breadth 8 cm and height 15 cm which is partly filled with water. If t...
A well with 30 metre inner diameter is dug 6 m deep. Earth taken out of it, has been evenly spread all around it to a width of 15 m to form an embankmen...
The volume of a sphere is 2304π cm3. Find the surface area of the given sphere.
The ratio between the number of sides of two regular polygons is 1 : 2 and the ratio between their interior angle is 2 : 3. Then the number of sides of ...
