28
Q:

# A watch which gains uniformly is 2 minutes low at noon on Monday and is 4 min. 48 sec fast at 2 p.m. on the following Monday. When was it correct?

 A) 2 p.m. on Tuesday B) 2 p.m. on Wednesday C) 3 p.m. on Thursday D) 1 p.m. on Friday

Answer:   B) 2 p.m. on Wednesday

Explanation:

Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.

${\color{Black}&space;\therefore&space;}$ The Watch gains ${\color{Black}&space;\left&space;(&space;2+4\frac{4}{5}&space;\right&space;)&space;}$ min.  or ${\color{Black}&space;\frac{34}{5}&space;}$  min.in 170 hrs.

Now,  $\inline \fn_cm \frac{34}{5}$min.are gained in 170 hrs.

${\color{Black}\therefore&space;}$  2 min.are gained in${\color{Black}\left&space;(&space;170\times&space;\frac{5}{34}\times&space;2&space;\right&space;)&space;}$ hrs=50 hrs

${\color{Black}&space;\therefore&space;}$ Watch is correct 2 days 2 hrs. after 12 p.m. on Monday i.e., it will be correct at 2 p.m. on Wednesday

Subject: Clock puzzles
Q:

If a Siren sounds for every 5 seconds, how many times will it sound in ¾ of an hour?

 A) 541 times B) 540 times C) 450 times D) 275 times

Explanation:

There are 60 minutes in an hour.
In ¾ of an hour there are (60 × ¾) minutes = 45 minutes.
In ¾ of an hour there are (60 × 45) seconds = 2700 seconds.
Siren sounds for every 5 seconds.
In 2700 seconds $\inline \fn_jvn \small \frac{2700}{5}$ = 540 times.

The count start after the first sound, the Siren will sound 541 times in ¾ of an hour.

Filed Under: Clock puzzles
Exam Prep: Bank Exams , CAT , GATE , GRE
Job Role: Bank Clerk , Bank PO , IT Trainer , Project Manager

1 1
Q:

Calculate the angle between the two hands of clock when the clock shows 4 : 20 p.m. ?

 A) 5 degrees B) 10 degrees C) 15 degrees D) 25 degrees

Explanation:

Since at 4 : 20 the minute hand will be at 4 and the angle between them will be same as the distance covered in degree by the hour hand in 20 minutes.

Required angle = distance of hour hand = speed × time = $\inline \frac{1}{2}$ × 20 =10 degrees.

Filed Under: Clock puzzles
Exam Prep: Bank Exams , CAT , GATE , GRE
Job Role: Bank Clerk , Bank PO

1 1
Q:

7:05

Explanation: As you move from left to right, the time shown on each watch decreases by 12 minutes, then 24, 36 and 48.

Subject: Clock puzzles

666
Q:

6:45

Explanation: As you move from left to right, add 1 to the value of each digit on the watch, and rotate the digits one place to the left.

Subject: Clock puzzles

822
Q:

To the 6

Explanation:

Starting with the top left clockface and working clockwise around the others, the sum of the numbers pointed to by the 2 hands starts at 3 and increases by 2 each time.