If p : q : r = 1: 2: 4, then $$\sqrt{5p^{2}+q^{2}+r^{2}}$$ is equal to 

A boat covers a certain distance against the stream in 9 hours 36 min and it covers the same distance along the stream in 6 hours. What is the ratio of the speed of the boat in still water to that of the stream?

The total area of a circle and a square is 5450 cm². The diameter of the circle is 70 cm. What is the difference between the circumference of the circle and the perimeter of the square?

If $$ {x+{1\over x}=7}$$ then $$ {x^{2}+{1\over {x^{2}}}=?}$$

Direction: Study the following information to answer the questions.

What is the average number of male customers in hotel B on Monday, Wednesday and Thursday?

By selling 33 metres of cloth a person gain the cost price of 11 metres. find the gain%

Two successive discounts of 20% and 30% are given while selling an article. What is the ratio of the marked price of the article to its selling price?

What should come in place of the question mark '?' in the following number series?

0.25, 1.25, 4.5, ?, 70, 355