A water tank has holes. The 1st hole alone empties the tank in 9 min and 2nd hole alone empties the tank in 6 min. If water leaks out at a constant rate, how many min does it take if both the holes together empty the tank?
In Feb 2016, which city topped the 'Swachh Survekshan - 2016' rankings of 73 cities in India with minimum open defecation and extensive adoption of solid waste management practices?
Vishnu travelled equal distances at speeds of 10 kmph, 30 kmph and 8 kmph and took a total of 15.5 min to complete. Find the total distance he travelled, in km.