Let us assume the speeds of Arvind and Surbhi are 'a' and 's', respectively. Let us say they meet after ' t ' hours ⇒ Arvind travelled s*t distance in 6hrs and Surbhi travelled a⋆t in 24hrs ⇒s*t=a*6 and a*t=s⋆24⇒t2=6×24⇒t=12 Given a=54⇒s⋆12=54⋆6⇒s=27. ⇒ Total distance between A and B is (s+a)⋆t=(54+27)⋆12=81⋆12=972Kms.