Which expression gives average speed of gas molecules?

The average speed of gas molecules is equal to

The average speed of gas molecules is equal to :

The expression of average speed of molecules of a gas is given as :

The expression of average speed of molecules of a gas is given as :

At what temperature, the average speed of gas molecules be double of that at temperature, 27^(@)C ?

Assertion:Pressure is exerted by gas in a container with increasing temperature of the gas. Reason: With the rise in temperature, the average speed of gas molecules increases.

The temperature at which the average speed of the gas molecules is double to that at a temperature of 27^(@)C is

The temperature at which the average speed of the gas molecules is double to that at a temperature of 27^(@)C is

The temperature at which the average speed of perfect gas molecules is double than at 17^(@)C is