Sangeeta and Swati bought two wristwatches from Jamshedpur Electronics at 11.40 A.M. IST. After purchasing they found that when 60 minutes elapses on a correct clock (IST), Sangeeta’s wrist watch registers 62 minutes whereas Swati’s wristwatch registers 56 minutes. Later in the day Sangeeta’s wristwatch reads 10 P.M., then the time on Swati’s wristwatch is:
Answer: B As per the data in the question when Sangeeta’s wrist-watch moves 62 minutes Swati’s wrist-watch moves only 56 minutes. =>When Sangeeta’s wrist-watch will move 620 minutes, Swati’s wrist-watch will move only 560 minutes. So there will be a difference of 60 minutes between the times shown by the wrist-watches of Sangeeta and Swati. =>If Sangeeta’s wrist-watch shows 10 p.m. Swati’s wrist watch will show 9 p.m.
Q. No. 2:
In a clock having a circular scale of twelve hours, when time changes from 7:45AM to 7:47AM , by how many degrees the angle formed by the hour hand and the minute hand changes?
Answer: B Minute hand cover, 360° in 60 min In 1 min it covers 6° Hours hand cover 1/2 degree in 1 min From 7:45 – 7:47 i.e. after 2 minutes In two minute min. hand moves 6 × 2 = 12° In two minute hr. hand moves 1/2 * 2 = 1 degree Difference required = 12 – 1 = 11°
Q. No. 3:
Sangeeta and Swati bought two wristwatches from Jamshedpur Electronics at 11.40 A.M. IST. After purchasing they found that when 60 minutes elapses on a correct clock (IST), Sangeeta’s wristwatch registers 62 minutes whereas Swati’s wristwatch registers 56 minutes. Later in the day Sangeeta’s wristwatch reads 10 P.M., then the time on Swati’s wristwatch is:
Answer: B As per the data in the question when Sangeeta’s wrist-watch moves 62 minutes Swati’s wrist-watch moves only 56 minutes. When Sangeeta’s wrist-watch will move 620 minutes, Swati’s wrist-watch will moveonly 560 minutes. So there will be a difference of 60 minutes between the times shown by the wrist-watches of Sangeeta and Swati. If Sangeeta’s wrist-watch shows 10 p.m. Swati’s wrist watch will show 9 p.m.