Pipe A can fill an empty cistern in 4 hours while along with Pipe B it can fill it up in 3 hours. Only Pipe A is turned on for an hour after which Pipe B is also turned on. How much total time will it take to fill up the cistern?
A man, rowing a boat, covers a distance of 16 km in two hours downstream. He covers half the distance in same amount of time when rowing upstream. Calculate the speed of the stream.
ESPN annually ranks 100 of the most famous active sportspersons in the world to create the 'ESPN World Fame 100' list. Which Indian player had the highest ranking in this list in 2017?