At 5 o'clock, the hands are 25 min. spaces apart.
To be at right angles and that too between 5.30 and 6, the minute hand has to gain (25 + 15) = 40 min. spaces.
55 min. spaces are gained in 60 min.
| 40 min. spaces are gained in |
❨ |
60 |
x 40 |
❩min |
= |
43 |
7 |
min. |
| 55 |
11 |
| ∴ Required time = 43 |
7 |
min. past 5. |
| 11 |
