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