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7.2 Engine trouble. In the frame of a moving car, the driver coughs, and at the same
moment (by coincidence) a puff of smoke emerges from the tailpipe. In the Earth's frame
which is true?
a. These two events are again simultaneous.
b. The puff of smoke emerges before the driver coughs.
c. The driver coughs before the puff of smoke emerges.
d. The driver never coughs.
Explain your answer in one sentence.

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