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Rate downstream = 7/10 x 60 = 42 km/hr Rate upstream = 42/2 = 21 km/hr Speed of current = 1/2 (Rate downstream – Rate upstream) ⇒ 1/2 (42 – 21) km/hr = 10.5 km/hr
Lateral surface area of a cube is 420 cm2 less than the lateral surface area of a cylinder. Height of cylinder is 2R cm and radius is R cm. I...
One side of a parallelogram is 25 cm and its distance from the opposite side is 9 cm. The area of the parallelogram is:
If the length of a rectangle is increased by 30% and its breadth is decreased by 20%, then the area of the rectangle will be increased or decreased by h...
An equilateral triangle ABC is inscribed in a circle with centre O. D is a point on the minor are BC and ∠ CBD = 40°. Find the measure of ∠ ...
A maximum size sphere is cut from a hemisphere of radius r. Find the ratio of volume of hemisphere to sphere?
A racetrack is in the shape of a rectangle with length of 45 meters and area of 6030 m 2 . A car takes 16 seconds to make one lap around the ...
The cost of fencing a rectangular plot at the rate of Rs. 12/metre is Rs. 960. If the ratio of the length to breadth is 5:3, find the area of the rectan...
Curved surface area of cylinder is 1617 cm2. If ratio of radius to height of the cylinder is 25:21 respectively, then find the base area of t...
The volume of a sphere is 2304π cm3. Find the surface area of the given sphere.
In a right angles trainagle, one acute angle is double the other. If the length of its hypotenuse is 20 cm, the find its area?
