Discovering Aptitude !

Compendium!

Clocks
1. Minute hand covers 360 degree in 60 minutes (1 hour) i.e. 6 degree in one minute.2. Hour hand covers 360 degree in 12 hours i.e. 30 degree per hour.3. The two hands of a clock coincide 11 times in a 12 hour period.4. The two hands of a clock lie in a straight line 11 times in 12 hour period.5. A minute hand covers 6 degree in one minute where as hour hand covers 1/2 degree in one minunte hence relative speed between minute hand and hour hand is 6 - 1/2 = 5 1/2 degree.6. A minute hand covers 60 minute divisions per hour and hour hand covers 5 min divisions per hour hence relative speed between minute hand and hour hand is 60 - 5 = 55 minutes.7. To caluculate the angle between hands of the clock use the following formula:angle = (11m/2) - (30h) if m > hangle = (30h) - (11m/2) if h > m

posted by Parag Kalra @ 7:14 PM