A 900 metre long train crosses a 1200 metres long platform completely in 70 seconds. What is the speed of the train?

Direction : What value should come in the place of question mark (?) in the following questions?

$$ \sqrt{8281} =(?) $$

If A : B = 1 : 2 , B : C = 3 : 4 , C : D = 6 : 9 and D : E = 12:16 then A : B : C : D : E is equals to -

Six years ago, the ratio of the ages of Kunal and Sagar was 6 : 5. Four years hence, the ratio of their ages will be 11 : 10. What is Sagar's age at present?

The bar chart given below shows the exports (in ₹000) and imports (in ₹000) of a country for 5 consecutive years.

What is the positive difference in the total export figures of all the five years taken together and the total import figures of all the five years taken together?

A alone can complete a work in 15 days and B alone can complete a work in 25 days. If they work on alternate days starting with A, in how many days the work will be finished?

The difference between the selling prices of a keyboard at losses 15% and 25% is Rs. 50. Then the cost price of a keyboard is :

Find the area of triangle whose medians are 8 cm, 15 cm and 17 cm respectively?