A grocer mixes 26 kg of tea which costs him Rs.200 a kig with 30 kg of tea which costs Rs.360 a kg and sells the mixture at Rs.300 a kg. What is the total percentage of gain ?

Two pipes can separately fill up a cistern in 2 hours and 3 hours respectively. If both the pipes are open simultaneously, in how many minutes will the cistern be filled ?

16 men can complete a piece of work in 8 days. 20 women take 16 days to complete the same piece of work. 12 men and 10 women work together for 6 days. How many more days would 10 women alone require to complete the remaining piece of work ?

A 150 metre long train moving at a speed of 30 m/sec passes a man moving in opposite direction with a speed of 5 m/sec. How many seconds will it take to cross the man ?