In November 2017, Indian Government approved setting up of ‘Pradhan Mantri Mahila Shakti Kendras’. These will be set up in how many most backward districts of the country?
A boat goes 15 km upstream and 10 1/2 km down stream in 3 hrs 15 min. It goes 12 km upstream and 14 km downstream in 3 hrs. What is the speed of the boat in still water?