Book Maths Puzzle

At what time between 4 and 5 o'clock will the hands of a watch point in opposite directions?

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Book Other Question

A watch which gains 5 seconds in 3 minutes was set right at 7 a.m. In the afternoon of the same day, when the watch indicated quarter past 4 o'clock, the true time is? At what time between 9 and 10 o' clock will the hands of a clock be together?