54) In a simple high pass RC filter, if the value of the capacitor is doubled, the cut off frequency is

55) The hypotenuse of a right angled triangle is 6 cm more than twice the shortest side. If the third side is 2 cm less than the hypotenuse, find the side of the triangle.

56) A car travels at an average of 40 km/hr in the first two hours and takes totally 5 hours to cover a distance of 230 km. What was the average speed in the last 3 hours?