Combine 3 queries for different lists into one


I am building API for client side apps. There are 3 API requests for 3 different lists as following:

tasksQuery = string.Format(@"<Where><And><Geq><FieldRef Name='Created' /><Value IncludeTimeValue='TRUE' Type='DateTime'>" + FromDate + "</Value></Geq><And><Eq><FieldRef Name='TaskCompleted' /><Value Type='Boolean'>0</Value></Eq><Or><Eq><FieldRef Name='CreatedBy' /><Value Type='Text'>" + LoggedUser + "</Value></Eq><Or><Eq><FieldRef Name='Responsible' /><Value Type='Text'>" + LoggedUser + "</Value></Eq><Or><Eq><FieldRef Name='Accountable' /><Value Type='Text'>" + LoggedUser + "</Value></Eq><Or><Contains><FieldRef Name='Consulted' /><Value Type='Note'>" + LoggedUser + "</Value></Contains><Contains><FieldRef Name='Informed' /><Value Type='Note'>" + LoggedUser + "</Value></Contains></Or></Or></Or></Or></And></And></Where>")  meetingQuery = string.Format(@"<Where><And><Geq><FieldRef Name='Created' /><Value IncludeTimeValue='TRUE' Type='DateTime'>" + FromDate + "</Value></Geq><Or><Eq><FieldRef Name='Organizer' /><Value Type='Text'>" + LoggedUser + "</Value></Eq><Eq><FieldRef Name='Creator' /><Value Type='Text'>" + LoggedUser + "</Value></Eq></Or></And></Where>")  newsQuery = string.Format(@"<Where><Eq><FieldRef Name='Status' /><Value Type='Text'>1</Value></Eq></Where><OrderBy><FieldRef Name='NewsArticleDate' Ascending='False' /></OrderBy>"; 

How can I combine all these queries in one query?