Speed of a boat in still water is 12 kmph and that of the current is 3 kmph. A man row a boat upstream up to 135 km and return downstream to the starting point. Find the total time taken for the entire journey in hours.

The value of which one of the following fractions falls in between $$ {3\over 5}$$ and $$ {7\over 8}$$?

Find the value of k in $$ {26\over 21}:{24\over 9 }::k :{14\over 13}$$

15 person can complete a work in 60 days. If the number of persons is increased by 5, how many days earlier will the work get completed?

If $$ {sin\ {θ}}={1\over {\sqrt{2}}}$$ then (tanθ+cosθ)=?

Twice the difference between two numbers is equal to their sum. If one number is 15, find the other number.

If a cuboid of dimensions 64cm×16cm×8cm is melted and recast into two equal cubes of same size. Then what will be the ratio of the surface are of cuboid to the total surface area of the two cubes?

Three solid metallic sphere whose radii are 3cm, x cm and 18cm respectively, are melted and recast into a single solid sphere of diameter 38cm. Then find the total surface area of the sphere with radius x cm?