What fraction of a clockwise revolution does the hour hand of a clock turn through, when it goes from
(a) 3 to 9 (b) 4 to 7
(c) 7 to 10 (d) 12 to 9
(e) 1 to 10 (f) 6 to 3
A clock completes a clockwise revolution of 360° in a day.
(a) 3 to 9
By looking at the clock we can see when the hour hand goes from 3 to 9 it complete half of the revolution which is 180°.
Fraction = 
.
As we know 180° is the half of the 360° so it covers 
.
(b) 4 to 7
By looking at the clock we can see when the hour hand goes from 4 to 7 it makes a right angle which is of 90°.
Fraction = 
.
(c) 7 to 10
By looking at the clock we can see when the hour hand goes from 7 to 10 it makes a right angle which is of 90°.
Fraction = 
.
(d) 12 to 9
By looking at the clock we can see when the hour hand goes from 12 to 9 it basically covers three right angles which is of = 90+90+90 = 120°.
Fraction = 
(e) 1 to 10
By looking at the clock we can see when the hour hand goes from 1 to 10 it basically covers three right angles which is of 120°.
Fraction = 
(f) 6 to 3
By looking at the clock we can see when the hour hand goes from 6 to 3 it basically covers three right angles which is of 120°.
Fraction = 
