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Difficulty:
65%
(hard)
Question Stats:
37% (02:41) correct
63%
(03:07)
wrong
based on 27
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Improved version :
Desi’s watch loses 2.5 minutes per hour. The watch was set correctly at 11:50 am yesterday. When Desi’s watch shows 10:20 pm today, what will be the actual time?
(A) 11:20 pm
(B) 11:46 pm
(C) 11:50 pm
(D) 11:56 pm
(E) 12:00 am
Desi’s watch loses 2.5 minutes per hour. The watch was set correctly at 11:50 am yesterday. When Desi’s watch shows 10:20 pm today, what will be the actual time?
(A) 11:20 pm
(B) 11:46 pm
(C) 11:50 pm
(D) 11:56 pm
(E) 12:00 am
19 Apr 2026, 08:44
Kudos
Bookmarks
Desi’s watch loses 2.5 minutes per hour, so in 1 real hour (60 minutes), the watch shows only 57.5 minutes.
This gives the key ratio: watch time=57.5/60 × real time
From 11:50 am yesterday to 10:20 pm today:
Total = 34h 30m = 34.5 hours
watch time =34.5
real time=watch time×60/57.5
real time=34.5×60/57.5=36 hours
Starting from 11:50 am yesterday:
+24 hours → 11:50 am today
+12 hours → 11:50 pm today
This gives the key ratio: watch time=57.5/60 × real time
From 11:50 am yesterday to 10:20 pm today:
Total = 34h 30m = 34.5 hours
watch time =34.5
real time=watch time×60/57.5
real time=34.5×60/57.5=36 hours
Starting from 11:50 am yesterday:
+24 hours → 11:50 am today
+12 hours → 11:50 pm today
57.5/60 hrs is the ratio of time elapsed.
11.5/12 or 23/24 is the ratio concerned.
Real time = 24/23 * Desi's time.
Real time = 24/23 * 34.5
= 36 hours.
Which is 1.5 hrs from 10:20pm = 11:50 pm.
Answer: Option C
11.5/12 or 23/24 is the ratio concerned.
Real time = 24/23 * Desi's time.
Real time = 24/23 * 34.5
= 36 hours.
Which is 1.5 hrs from 10:20pm = 11:50 pm.
Answer: Option C
kevincan
