Which Alice?

The Gryphon and the Mock Turtle
Turtle
HOW FAR AWAY IS THE SCHOOL? The Mock Turtle was
weeping bitterly the whole time that Alice and the Gryphon were
solving the last puzzle.
"Now, what's so sad about that?" yelled the Gryphon angrily. "The
guy caught the train, didn't he?"
"Ye-es," admitted the Mock Turtle, "but we don't know what
happened after that! For all we know, the train might have gotten
wrecked!"
"Now, really!" said Alice. "At that rate you can make a sad story
out of anything!"
The Mock Turtle made no reply to this, but once again buried his
face in his paws.
"All right, here's another sad one," he said at last. "One morning
a boy had to go to school—"
"Ah, that is sad!" admitted the Gryphon.
"No, no, that's not the sad part," said the Mock Turtle, "the sad
part is yet to come!"
Alice and the Gryphon listened attentively for the sad part, but
were unable to discover it.
"Now," continued the Mock Turtle, "the father said to the boy,
'You better hurry up or you'll be late for school!' The boy replied,
'Oh, I know exactly what I am doing: If I walk at the rate of four
miles an hour, I'll be five minutes late, but if I walk at five miles an
hour, I'll be ten minutes early.'
"How far away was the school?"
49