The sum of the ages of A, B and C at present is 85 years. 10 years ago the ratio of their ages was 1 : 3 : 7. The present age of C is what percentage of the present age of B?

Two pipes can separately fill a tank in 10 hours and 40 hours respectively. Both the pipes are opened together to fill the tank, but when the tank is half-filled a leakage develops, through which $1\over2$ of the water supplied by both the pipes leaks out. What is the total time taken to fill the tank?

Two stations X and Y are 1040 km apart. A train starts from station X at 11 am, and moves towards Y at a speed of 40 kmh, and the other train starts from Y at 1pm and moves towards X at a speed of 80 kmh. At what time will both the trains meet?.

The following graph shows the net percentage profit of two companies, A and B for the period 2006 to 2012

If in the year 2008, the expenditure of Company A and the income of Company are Rs. 84 lakh each, what is the difference (in Rs.) between the income of Company A and the expenditure of Company B in that year?