Ray Optics and Optical Instruments Part 2

A point object, ' O ' is placed in front of two thin symmetrical coaxial convex lenses L1 and L2 with focal length 24‌cm and 9‌cm respectively. The distance between two lenses is 10‌cm and the object is placed 6‌cm away from lens L1 as shown in the figure. The distance between the object and the image formed by the system of two lenses is ________ cm.