In 1884, during an international congress in Washington, USA, a worldwide standard of time was established. Based on the map and the information ab...

In 1884, during an international congress in Washington, USA, a worldwide standard of time was established. Based on the map and the information above, consider the following situation: João, who lives in the city of Beijing, China, receives a phone call at 9 am on a Monday from Maria, who lives in the city of Manaus, Brazil. At what time and on what day of the week did Maria call?
a) 21h on Sunday.
Gabarito: a