wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

My watch was 8 minutes behind at 8 pm on Sunday but within a week at 8 pm on Wednesday it was 7 minutes ahead of time. During this period at which time this watch has shown the correct time :

A
Tuesday 10 : 24 am
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
Wednesday 9: 16 pm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
It cannot show the correct time during this period
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
None of the above
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B Tuesday 10 : 24 am
The answer is option $$
Let's assume there a clock A which runs accurately.
Let's call our watch as B
Speed of clock A=60min/hr
From Sunday 8pm till Wednesday 8pm, A covers (3×24×60)mins=4320mins
In the same time minutes covered by B=4320+8+7=4335mins
Speed of B=4335/(3X24)=60524mins/hr
Relative velocity of B wrt A=6052460=(5/24)min/hr

To show the correct time, the watch B needs to cover up 8mins wrt A
Time taken by B to cover 8mins wrt A=8(524)=8×245=38.4hrs=38hrs24mins

On Tuesday at 10am it would have been 38 hours from Sunday 8pm
So on Tuesday 10:24am the watch will show correct time

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Relative Motion
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon