If a clock strikes six times in 5 seconds, the number of strikes in 10 seconds is

How many times do the hands of a clock coincide in a day?

At what time between 7 and 8 o'clock will the hands of a clock be in the same straight line but, not together?

A watch which gains 5 seconds in 3 minutes was set right at 7 a.m. In the afternoon of the same day, when the watch indicated quarter past 4 o'clock, the true time is:

At what time between 5.30 and 6 will the hands of a clock be at right angles?

If a clock gains four minutes every hour, the angles traversed by the seconds hand in one minute will be-