When the NASA Rover Spirit successfully landed on Mars in January of 2004, Mars was 170.2 × 106 km from Earth. Twenty-one days later, when the Rover Opportunity landed on Mars, Mars was 198.7 × 106 km from Earth, (a) How long did it take for a one-way transmission to the scientists on Earth from Spirit on its landing day? (b) How long did it take for scientists to communicate with Opportunity on its landing day?
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