Tips And Tricks And Shortcuts For Clocks

December 16, 2022

Shortcuts For Clocks In Aptitude

A clock has two hands,one is the hour hand and the second is the minute hand. Both hands move around the circular dial. The hour hand is smaller than the minute hand The hour hand shows time in hours . And the minute hand shows time in minutes. Here are some easy tips and tricks for clocks which efficiently help in the competitive exam.

Below 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.
Speed of the minute hand= 6° per minute.
Speed of the hour hand= 0.5° per minute.
Relative Speed between hour and minute hand. Relative speed of minute hand is 6 – 0.5 dpm = 5.5 dpm. Where dpm = dial per minute.

Type 1: Shortcuts on Clocks.

Question 1. 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

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

Multiplying hours according to formula = 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°

Correct Option: A

Type 2: Shortcuts to Solve Clocks

Question 1 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

Solution: 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

Correct Option: A

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