Fast and Slow Clock Problems: 1 Technique, Key Terminology, and Shortcut Tricks - Videos

1
186

In this video, Mayank discusses techniques for solving problems involving fast and slow clock problems which are becoming increasingly common in competitive exams.

Fast and Slow Clocks
Get this Terminology- Important!!!
If a clock’s hands are moving, it is running. This is the mechanical sense of run, like a car or a pump or a meter.
Fast and slow refer to the displayed time:
If a clock’s hands take 59 minutes to complete one hour, it is running fast. If the clock displays 5:00 and it’s known to be 4:59, the clock is (or is running) fast.
If a clock’s hands take 61 minutes to complete one hour, it is running slow. If the clock displays 5:00 and it’s known to be 5:01, the clock is (or is running) slow.
A watch which gains time uniformly is 5 minutes slow at 8’O clock in the morning on Sunday and is 5 minutes 48 seconds fast at 8 PM the following Sunday.  When was it correct?
A clock is set right at 8 AM.  The clock gains 10 minutes in 24 hours. What will be the true time when the clock indicates 1 PM the following day?
How much inaccurate does a watch become per day, if its hands coincide every 64 minutes?
The inhabitants of planet Mars measure time in different hours and minutes from earth.  Their day has 36 hours with each hour being 120 minutes.  The dials of their clocks show 36 hours.  What is the angle between the hour hand and the minutes hand of a Martian clock at 9:48? Angle around a Martian point is 720 degrees.
2 clocks A and B are now showing 3’o clock. Clock B is 2 mins/hour faster than clock A. How long will it take them to show the same time again?
1st clock gains 5 mins every 1 hour. 2nd clock loses 5 mins every 1 hour. After how many hours both will show same time again?
A clock loses exactly 20 minutes every hour. It is now showing 4:00 am and was correct at midnight. The clock stopped 4 hours ago, what is the correct time now?
Next Class: Speed Problems

This video will be useful for students preparing for entrance exams like JEE, SAT, ACT, GATE, GMAT, GRE.
Also aspirants preparing for examinations like Bank PO, SSC, NTSE, IAS CSAT will find the concepts in this video helpful.

For CAT preparation visit – https://www.examrace.com/CAT/CAT-FlexiPrep-Program/Postal-Courses/Examrace-CAT-Series.htm

For IAS Prelims CSAT Paper II Postal Course visit http://www.examrace.com/IAS/IAS-FlexiPrep-Program/Postal-Courses/Examrace-IAS-CSAT-Prelims-Paper-II-Series.htm

Fro online resources for IAS: https://www.doorsteptutor.com/Exams/IAS/

For complete postal course refer http://www.examrace.com/Study-Material/Aptitude/Aptitude-FlexiPrep-Program/Postal-Courses/Examrace-Aptitude-Series.htm or email [email protected]

source

1 COMMENT

LEAVE A REPLY

Please enter your comment!
Please enter your name here