Question #ce8dd

1 Answer
Nov 27, 2017

In 4 " hours"4 hours

Explanation:

Since they are travelling in opposite directions, the distance between them is increasing at the rate of
55 " mph" + 45" mph"=100" mph"55 mph+45 mph=100 mph

They will be 400 " miles"400 miles apart in
color(white)("XXX")(400 " miles")/(100 " miles per hour")=4" hours"XXX400 miles100 miles per hour=4 hours