JEE Advanced Model Paper 7 with solutions for online practice

A ray of light is sent along the line x - 2y + 5 = 0 , upon reaching the line 3x - 2y + 7 = 0 , theray is reflected from it. If the equation of the reflected ray is ax + by + c = 0 such that ‘a’ is aprime number and b,c are integers then integral part of

c

a

is