ABC26GN5178 · Clocks
Subject: General Aptitude · Chapter: Clocks · Exam: 2004 · Marks: · Difficulty:
At 9:38 A.M, through how many degrees the hour hand of a clock moved since noon the previous day?
Answer
Explanation
Time from 12 noon to 9 : 38 A.M. = 12 hrs + 9 hrs 38 min = 21 hrs 38 min. 38 19 649 = 21 hrs = 21 hrs = hrs. 60 30 30 Angle traced by the hour hand in 12 hrs = 360°. Angle traced by the hour hand in 649 360 649 hrs = × ° = 649°. 30 12 30 9.Angle traced by hour hand in 12 hrs. = 360°. 11 360 11 ° Angle traced by it in hrs = × = 110°. 3 12 3 Angle traced by minute hand in 60 min. = 360°. 360 ° Angle traced by it in 40 min. = × 40 = 240°. 60 ∴ Required angle = (240 – 110)° = 130°. 830
Explanation as extracted from the printed page; notation may be imperfect.
Open in whiteboard · Browse this chapter in the app