In the given figure, two squares shown in the figure have the arm of 12 cm and 8 cm. then find out the area of shaded part?

Simplification 

A train 270 meters long is running at a speed of 36 km per hour then it will cross a bridge of length 180 meters in : 

A policeman starts to chase a thief. When the thief goes 10 steps the policeman moves 8 steps and 5 steps of the policeman are equal to 7 steps of the thief. The ratio of the speeds of the policeman and the thief is: 

The cost price of an article is Rs. 800. After allowing a discount of 10 %, a gain of 12.5 % is made. Then the marked price of the article is 

In what proportion must a grocer mix sugar at Rs. 12 a kg and Rs. 7 a   kg Sugar as to make a mixture worth Rs 8. a kg?

What is the square root of 0.09 ?

 A 450 meter long train crosses a bridge 650 meters long in 36 seconds. What is speed (in km/hr) of the train?