I've got a physics problem that I haven't been able to solve Help!

A rocketship, travelling away from earth with a speed of 0.8c sends regular radio signals which are received on Earth every 45.2 min. According to the rocketship astronauts, how frequently are the signals being sent?
:confused:

Try to find the equation on "time dilation," apply it to this problem, then post your answer. Someone will help if you need it then.

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