Pipe A can fill a tank in 10 minutes and pipe B can empty it in 15 minutes. If both the pipes are opened in an empty tank, the time taken to make it full is
20 minutes
25 minutes
30 minutes
None of the above
For election to the Lok Sabha, a nomination paper can be filed by
Miscellaneous · Easy
In a month if the seventh day is three days earlier than Saturday,then the nineteenth day of the month will be a
Miscellaneous · Easy
Which among the following events happened earliest ?
Miscellaneous · Easy
An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
Miscellaneous · Easy