A stiff bar of negligible weight transfers a load p to a combination of three helical springs arranged in parallel as shown in the above figure. The springs are made up of the same material and out of rods of equal diameters. They are of same free length before loading. The number of coils in those three springs is 10, 12 and 15 respectively, while the mean coil diameters are in ratio of 1:1.2:1.4 respectively. Find the distance ‘x’ as shown in figure, such that the stiff bar remains horizontal after the application of load P.