The value of \[\left(\frac{\sqrt{64}}{\sqrt{36}}\right)^2\] is

A alone can complete a work in \[12\] days. A and B together can complete it in \[8\] days. How long will B alone take to complete the work ?

Two barrels a contain a mixture of ethanol and gasoline. The content of ethanol is 60% in the first barrel and 30% in the second barrel. In what ratio must the mixtures from the first and the second barrels be taken to form a mixture containing 50% ethanol?

The speed of a boat in still water is 10 km/h and the speed of the stream is 5 km/h. What is the speed of the boat in the direction of the stream?

A train of length \[300\] m crosses a platform of length \[50\] m with the speed \[7\] m/s. Find the time taken by the train to cross the platform.

Pipe A takes \[15\] minutes to fill a tank. Pipe B and C together take \[10\] minutes to fill the same tank. In how much time will the tank be fully filled if all the pipes work together?

A worker is paid \[Rs.1000\] to complete a piece of work. He gets \[Rs.200\] as daily wage. He worked for __________ days.

An amount of \[Rs.6,000\] lent at \[5\%\] per annum compound interest for \[2\] years will become

Fifteen years hence, a man will be four times as old as he was fifteen years ago. His present age is