Water is pouring into a cuboidal reservoir at the rate of 60 litres per minute. If the volume of reservoir is 108 m3, find the number of hours it will take to fill the reservoir.
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72.Fill in the blanks. (i) 1 cm3 = 1 cm x 1 cm x 1 cm = ....mm3 (ii) 1 m3 = 1 m x 1 m x 1 m = ......cm3
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73.Fill in the blanks.
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74.Find the height of a cuboid whose volume is 275 cm3 and base area is 25 cm2.
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75.A godown is in the form of a cuboid of measures 60 m × 40 m × 30 m. How many cuboidal boxes can be stored in it if the volume of one box is 0.8 m3?
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76.A rectangular paper of width 14 cm is rolled along its width and a cylinder of radius 20 cm is formed. Find the volume of the cylinder. (Take )
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77.A rectangular piece of paper is having measures 11 cm × 4 cm. It is folded without overlapping to make a cylinder of height 4 cm. Find the volume of the cylinder.
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Long Answer Type
78.A rectangle and a square have equal perimeter. If the breadth of the rectangle is 10 cm and the side the square is 15 cm, then find the difference between their areas.
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Short Answer Type
79.Find the area of the following trapezium.
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Long Answer Type
80.Find the length of the diagonal BD when, the area of the quadrilateral is 32 cm2.