The simple interest on a sum of money will be Rs 500 after 3 years. In the next 6 years, the principal becomes 5 times. What will be the total interest at the end of 8 years ?

A vessel of 50 litres is filled with milk and water. 40% of the milk and 15% of the water is taken out of the vessel. It is found that the vessel is emptied by 30%. What was the initial quantity of milk and water ?

A shopkeeper sold an item for Rs 600 after giving 20% discount on the labelled price and made 24% profit on the cost price. What would have been the percentage profit if he had not given the discount ?

Two cars travelled equal distances at the speed of 50 kmh"1 and 40 kmh"1 respectively. What is the distance if one car takes 5 hours longer than the other ?

Two trains of length 120m and 80m respectively with different speeds pass a pole in 3 seconds and 8 seconds respectively. In what time will they cross each other when they are moving in opposite directions ?