Question

How many times between 3 o clock and 6 o clock will hands of a clock coincide?

Answer 1

we know that:- 
in 12 hr it coincide 11 times
so in 3 hr it will coincide 11/12*3 =33/12=2.75 times approx , 
....how we get 3 is...the difference between 3&6=3