Tips And Tricks And Shortcuts For Clocks

November 17, 2019

Best tips & tricks on Clocks problems easily

Here are some easy tips and tricks for you on problems based on clocks which efficiently help in the competitive exam.
It is very important topic for recruitment drive.

There are following types of questions asked in exams.

Relative Speed between hour and minute hand
Relative speed of minute hand is 6 – 0.5 dpm = 5.5 dpm

What is the angle between the minute hand and the hour hand when the time is 5:30.

Options:

A.15 °

B. 10°

C. 20°

D. None of the above

Tip: Simple formula to calculate the angle between the minute and the hour hand = (X*30)-((Y*11)/2)

Multiplying hours with minutes, we get = 5 x 30 = 150

Applying the formula, we get (Yx11)/2

= 30 x 11/ 2

= 165

When we subtract the two values, we get,

= 165 – 150

= 15°

Calculate the time between 7 and 8 o’clock when the hands of a clock are in the same straight line but are not together?

Options:

A. 7:05(5/11 ) o’clock

B. 7:50 (1/13) o’clock

C. 7:20 o’clock

D. Cannot be determined

Tip: The short formula to calculate the time when the angle is given is,

Angle = 30 (hours) – 11/2 (minutes)

Using the above formula, we get

180 = 30 (hours) – 11/2 (minutes)

180 = 30 (7) – 11/2 (minutes)

11/2 minutes = 210-180

Minutes = 30*2/11

= 5( 1/5)

Time = 7:05(5/11) o’clock

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