Discussion
If a tide occurs at a place at 6 p.m. when will be the next tide occur ?
Answer: B
A tide at a place is followed by the next high tide after an interval of about 12 hours 26 minutes, since the moon's orbital motion makes the tidal day about 24 hours 52 minutes. A tide at 6 p.m. is therefore followed by the next one at about 6.26 a.m. of the next day. The timings 00.13 a.m., 12.39 p.m. and 06.52 p.m. correspond to an interval of 6 hours 13 minutes, 18 hours 39 minutes and 24 hours 52 minutes, which are not the gap between two successive high tides.
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