A tomb was begun in 2461 BC the first had begun in 2468 BC how many years passed?

To find out how many years passed between the start of the first tomb in 2468 BC and the start of the second tomb in 2461 BC, you subtract the later year from the earlier year: 2468 - 2461 = 7 years. Therefore, 7 years passed between the beginning of the two tombs.