Two spaceships approach each other at speeds of (0.80 c) and (0.90 c) relative to the sun.

Question:

Two spaceships approach each other at speeds of $0.80 c$ and $0.90 c$ relative to the sun. When they are $5.0 \times 10^{9} \mathrm{~m}$ apart, as measured in the sun's reference frame, they each set their clocks to zero. By how much do their clocks differ at the instant they pass each other?

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