In one and a half hours, the minute hand of a clock rotates through an angle of
- 90o
- 180o
- 640o
- 450o
-
540o
The correct answer is: E
Explanation
1 hr, = 60 mins, 60 mins = 360o
30 mins = \(\frac{360^o}{1}\) c \(\frac{30}{60}\)
= 180o
90 mins = 360 + 180o
= 540o