Henry Ernest Dudeney/Puzzles and Curious Problems/63 - Westminster Clock

by : $63$

 * Westminster Clock
 * A man crossed over Westminster Bridge one morning between eight and nine o'clock by the tower clock
 * (often mistakenly called Big Ben, which is the name of the large bell only. But this is by the way).
 * On his return between four and five o'clock he noticed that the hands were exactly reversed.
 * What were the exact times he made the crossings?