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Question

A watch showed five past five on Wednesday evening when the correct time was 5:00 p.m. It loses uniformly, and was 5 minutes slow after two days at 7:00 p.m. When did the watch show the correct time?


A
Thursday 6:00 a.m.
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B
Thursday 6:00 p.m.
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C
Thursday 6:30 p.m.
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D
Thursday 5:00 a.m.
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E
None of these
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Solution

The correct option is B Thursday 6:00 p.m.
Since the watch was 5 minutes fast on Wednesday evening, 5:00 p.m. and was 5 minutes slow after two days at 7:00 p.m., the correct time would be at the mid point of these 2 times.
Time difference=(24+24+2)50 hours,
So the right time will be 25 hours past 5 p.m. Wednesday,
I.e, 6 p.m. on Tuesday.

Mathematics

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