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gelombang primer = 07.38.10
gelombang sekunder = 07.55.45
ditanya : jarak ......?
rumus
( gelombang sekunder - gelombang primer ) - 1 x 1000 km
( 07.55.45 - 07.38.10) - 1 x 1000 km
= 17.35 - 1 x 1000 km
= 16.5x 1000 km
= 16500 km