In how many years a sum of Rs. 3000 will yield an interest of Rs. 1080 at 12% per annum simple interest?

A 240 m long train crosses a 300 m long platform in 27 seconds. What is the speed of the train in km/h?

A alone would take 6 hours more to complete the job than if both A and B would work together. When B worked alone he took 1.5 hours more to complete the job and A and B worked together. How much time they will take if they if they work together?

Mr. Dutta desired to deposit his retirement benefit of ₹3 lacs partly to a post office and partly to a bank at 10 % and 6 %  simple interests respectively. If his monthly interest income was ₹ 2000, then the difference of his deposits in the post office and in the bank was -

A cyclist cycles 8 km at 15 km/hr and a further 4 km at 20 km/hr. Find the average speed in km/hr. 

Rs.4000 becomes Rs. 5000 in 4 years at a certain rate of compound interest. What will be the sum at the end of 12 years?

What will be the value of x³+y³+z³-3xyz when x+y+z=9 and x²+y²+z²=31?

A shopkeeper marks up the price of his product by 40%. If he increases the discount from 5% to 10%, the profit would decrease by Rs 14. How much profit would he earn if he gives a discount of 20% on the marked price?