Misc: what was the name of ac/dc's lead singer who died from alchol poisioning in 1980?

Questions

In what year was the first working helicopter built?

In what year was the Panama Canal opened?

In what year was the U S transcontinental railway completed?

In what year was the world's first speed limit regulation introduced?

In which African city & country do the white Nile & blue Nile converge?