Two friends, whom we will call Arthur and Robert,
were curators at the Museum of American History.
Both were born in the month of May, one in 1932
and the other a year later.
Each was in charge of a beautiful antique clock.
Both of the clocks worked pretty well, considering
their ages, but one of them lost ten seconds an
hour and the other gained ten seconds an hour.
On one bright day in January, the two friends set
both clocks right at exactly 12 noon.
"You realize," said Arthur, "that the clocks will start
drifting apart, and they won't be together again until,
let's see, why, on the very day you will be 47 years
old. Am I right?" Robert then made a short calculation.
"That's right!" he said.
Who is older, Arthur or Robert?