How many times in a day the hands of a clock are straight?

Eight times in a day the hands of a clock form straight angle. At first they form straight angle when the hour amd minute hand are on 3 and 9 in noon and night.Second, when the hour amd minute hand...

3 o' clock 6 o'clock 9 o' clock 12 o'clock

The hands of a clock coincide 11 times in every 12 hours (Since between 11 and 1, they coincide only once, i.e., at 12 o'clock).AM12:00 1:05 2:11 3:16 4:22 5:27 6:33 7:38 8:44 9:49 10:55 PM12:00 1:05...

4 times 6:00am, 6:00pm, 12:30am,12:30pm