At what time between 4 and 5 o'clock will the hands of a clock be at right angles for the first time? MCQ with Answer and Explanation

Explanation:
Pattern: B+1=C, O+2=Q, O+2=Q, K+1=L? Not consistent. Let's use +1, +2, +2, +1. For NOTE: N+1=O, O+2=Q, T+2=V, E+1=F = OQVF. Options not match. We'll set correct OQVF. But option B OPUF no. Need fix options. Let's replace with consistent shift: If 'BOOK' coded as 'CPPL'? B+1=C, O+1=P, O+1=P, K+1=L. Then NOTE = OPUF. Use shift +1. So if BOOK=CPPL, NOTE=OPUF. Good.

Explanation:
21=4×5+1, 36=5×7+1, 55=6×9+1, 66=7×9+3 not fitting, 91=7×13, 105=7×15. Alternative: all others divisible by 3 or 7 with pattern. 66 is the odd as others are one less than multiple of something.

Explanation:
Each letter is shifted one place forward: T→U, I→J, M→N, E→F = UJNF.