To calculate times in navigation, the Groundspeed (GS) is required, which is equal to:

• GS = TAS + Tailwind component, or
• GS = TAS - Headwind component

For this question, GS is given as 107 kt.

The ground distance covered is 100 NM. Thus, the flight time required is: Ground Distance / GS = 100 NM / 107 kt = 0.93 hr or 00:56 approximately.

Thus, the Estimated Time of Arrival (ETA) is: ETD + Flight time = 09:33 UTC + 00:56 = 10:29 UTC.

NOTE:

To convert the time from HH:MM to a decimal form, proceed as:

• 0.93 hr = 0.93x60 min = 55.8 min.