Read it through once

The tickets were round-trip ones—to Melbourne, and clear to Adelaide in South Australia, and then all the way back to Sydney. Twelve hundred more miles than we really expected to make; but then as the round trip wouldn't cost much more than the single trip, it seemed well enough to buy as many miles as one could afford, even if one was not likely to need them. A human being has a natural desire to have more of a good thing than he needs.