Q. How many times are the hour hand and the minute hand of a clock at right angles during their motion from 1.00 p.m. to 10.00 p.m.?
✅ Correct Answer: (C)
18
Explanation: The duration from 1.00 p.m. to 10.00 p.m. is 9 hours and during each of these 9 hours the hands of a clock are at right angles twice.
So, required number = 9 × 2 = 18.
So, required number = 9 × 2 = 18.
Explanation by: Tina Singh
The duration from 1.00 p.m. to 10.00 p.m. is 9 hours and during each of these 9 hours the hands of a clock are at right angles twice.
So, required number = 9 × 2 = 18.
So, required number = 9 × 2 = 18.