Aptitude question

@manish-r2Hoep • Oct 25, 2024

Oct 25, 2024

1.9K

At what time between 7 and 9 o'clock will the hands of a clock be in the same straight line but, not together?
A. 5 min. past 7
B. 5*(2 /11)min. past 7
C. 5 *(3/11)min. past 7
D. 5 *(5/11)min. past 7

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 1p.m. on Friday

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Morningdot Hablu

@morningdot-6Xuj4M • Jun 6, 2010

hey goyal check out your option b,c,d put the "+"sign in the place of "*".
i think 5+(5/11)min. past 7 is correct.
because hour hand will suffer some distance from 7 when minute hand arive on 5.
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Manish Goyal

@manish-r2Hoep • Jun 6, 2010

no options are correct

try it
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vishnu priya

@vishnu-priya-L6wLMl • Jun 6, 2010

Think it will be straight in case of the first option!
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Manish Goyal

@manish-r2Hoep • Jun 6, 2010

@vishnu :-no it is not correct option

@others Please give explanation along with answer
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sherya mathur

@sherya-mathur-cI63wY • Jun 6, 2010

solution:
at 7 o'clock ,the minute hand will be on 12
means minute hand and hour hand are 25 minute space apart
so for being in the straight line the minute hand will have to move 30-25=5 minute
as we know that 55 spaces are gained by 60 minutes
therefore 5 minutes will be gained in=(60/55)x5
=5.45 minute
or 5+5/11 minute past seven
so both hands will be in straight line but not together at 5+5/11 minute past 7
hope this will be the right answer
and gd explanation
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Morningdot Hablu

@morningdot-6Xuj4M • Jun 6, 2010

sherya mathur
solution:
at 7 o'clock ,the minute hand will be on 12
means minute hand and hour hand are 25 minute space apart
so for being in the straight line the minute hand will have to move 30-25=5 minute
as we know that 55 spaces are gained by 60 minutes
therefore 5 minutes will be gained in=(60/55)x5
=5.45 minute
or 5+5/11 minute past seven
so both hands will be in straight line but not together at 5+5/11 minute past 7
hope this will be the right answer
and gd explanation
hey i tell the same thing as you said.
so the option's are wrong.
but goyal said it,s not.

@goyal check out once more.
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Manish Goyal

@manish-r2Hoep • Jun 6, 2010

yes you are right and explanation is also correct

what about 2nd question?
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sherya mathur

@sherya-mathur-cI63wY • Jun 6, 2010

solution for second:
as the watch is 2 minute slow at monday noon and 4 minute 48 seconds fast at following monday at 2 pm
means in (24x7+2)=170 hours watch fasts (2+4 min 48 seconds)=360+48=408 seconds
there fore the equatio will be like this
408 seconds fast will be in =170 hours
1 '' '' ..........................=170/408 hours
120 seconds(to cover 2 minute slow)=170x120/408
= 50 hours
so the watch will show right time after 50 hours
and that time will be 2pm. on wednesday
I think this solution should also be correct
so option 'B' will be the right answer
plz tell me
am I correct or not?

Regards
sherya
CE..........
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Manish Goyal

@manish-r2Hoep • Jun 6, 2010

@mohit sorry i didn't notice your answer .you were correct

@shreya :-Yes you are right
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