Minimum Time Delay for Communicating with Astronaut on Moon: 2.5s

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ZedCar
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In communicating with an astronaut on the moon, 3.8x10^8 m from earth, what is the minimum time delay in getting a response to a question?

The answer in the book is given as 2.5 seconds.Have they simply used;

( (3.8x10^8) / c ) x 2
 
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Yes, i assume they have used ( (3.8x10^8) / c ) x 2 to get the distance from Earth to Moon and then back, then they have divided by speed of light.