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UPSC CDS 2 2018 Math Paper
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© examsnet.com
Question : 42
Total: 100
The minute hand of a clock overtakes the hour hand after every 72 minutes of correct time. How much time does the clock lose or gain in a day of normal time ?
[2018 CDS-II]
Lose 121
9
11
minutes
Lose 157
1
11
minutes
Gain 121
9
11
minutes
Gain 157
1
11
minutes
None of Above
Validate
Solution:
A right clock gains 60 minutes space over hour–hand in
720
11
minutes.
Here minute–hand overtakes the hour–hand in 72 minutes.
Thus, the time lost by minute–hand in 72 minutes
=
72
−
720
11
=
72
11
minute
Time lost in 24 hours
=
1
11
×
24
×
60
=
130
10
11
minute
© examsnet.com
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