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Question

At what time between 7 and 8 o' clock will the hands of a clock be in the same straight line but, not together?

A
5 min. past 7
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B
5211 min. past 7
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C
5311 min. past 7
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D
5511 min. past 7
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Solution

The correct option is D 5511 min. past 7
When the hands of the clock are in the same straight line but not together, they are 30 minute spaces apart. At 7 o'clock, they are 25 min. spaces apart.
Minute hand will have to gain only 5 min. spaces.
55 min. spaces are gained in 60 min.
5 min. spaces are gained in (6055×5) min. =5511 min.
Required time =5511 min. past 7

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