3:00 pm MT / 5:00 pm ET is a convenient time to arrange a meeting
When planning a call between Mountain Time and Eastern Time, you need to consider time difference between these time zones. MT is 2 hours behind of ET.
It is currently 3:00 pm in MT, which is a suitable time to arrange a call or meeting. In ET, the time would be 5:00 pm - a usual working time of between 11:00 am and 6:00 pm.
If you want to reach out to someone in ET and you are available anytime, you can also schedule a call between 5:00 am and 9:00 pm your time. This time span will be between 7:00 am and 11:00 pm ET time.