Question
An elephant can do a work as fast as two horses ‘A’
and ‘B’ can do it by working together. If horse ‘A’ alone can complete the work in 27 hours and horse ‘B’ in 54 hours, then find the time taken by elephant to complete the work.Solution
Let the total work = 54 units Efficiency of horse who can complete the work in 27 hours = 54/27 = 2 units/hour Efficiency of horse who can complete the work in 54 hours = 54/54 = 1 units/hour Therefore, time taken by both horses to complete the work together = 54/(2 + 1) = 18 hours Therefore, time taken by the elephant to complete the work = 18Â hours
The area of two similar triangles is 400 cm² and 324 cm², respectively. What is the ratio of their corresponding altitudes?
If the volume of a cuboidal tank is 3840 m3 and the ratio of the length, width and height of tank is 5:4:3 respectively then find the height ...
- Find the diameter of the incircle of a triangle whose semi-perimeter is 18 cm and area is 54 cm².
- Six cubes each of side 5 cm are attached end to end to form a cuboid. Find the total surface area of the cuboid.
If the length of the rectangular pipe is 2 times of its breadth and 5 times of its height. Find the total surface area if its volume is 600 cm³?
Cylinder radius = 7 cm, height = 12 cm. It is melted into cones of radius 3.5 cm, height 8 cm. Find number of cones.
Find the approximate volume of a right circular cone having diameter 14 cm and height 3cm.(Take pie = 3.14.)
The perimeter of a rhombus is 56 m and its height is 5 m. Its area is:
The perimeter of a rectangle is 68 cm more than its length. If the length and breadth of the rectangle are in the ratio 7:5, respectively, then find the...
