1. P-wave? S-wave? Time difference? Distance: 4580 km 2. P-wave? S-wave? Time difference? Distance: 5,200 km 3. P-wave? S-wave? Time difference? Distance: 1820 km Remember: To get the Time difference in the arrival of P and S wave, subtract the P-wave time of arrival to the S-wave time of arrival. You can draw lines in between boxes. Use the proper ratio in dividing the boxes according to their measurement. Use the Time-Travel graph on page 11 of your Self-Learning Module.​