Two observers agree to test time dilation. They use identical clocks, and one observer in frame S' moves with speed v = 0.6c relative to the other observer in frame S. When their origins coincide, they start their clocks. They agree to send a signal when their clocks read 60 min and to send a confirmation signal when each receives the other’s signal.

(a) When does the observer in S receive the first signal from the observer in S'?
(b) When does he receive the confirmation signal? 

(c) Make a table showing the times in S when the observer sent the first signal, received the first signal, and received the confirmation signal. How does this table compare with one constructed by the observer in S'?