When the NASA Rover Spirit successfully landed on Mars in January of 2004, Mars

Question

When the NASA Rover Spirit successfully landed on Mars in January of 2004, Mars was 169.7 106 km from Earth. Twenty-one days later, when the Rover Opportunity landed on Mars, Mars was 199.2 106 km from Earth. (For the speed of light use c = 2.998 108 m/s. Give your answer to two decimal places.) (a) How long did it take for a one-way transmission to the scientists on Earth from Spirit on its landing day? min (b) How long did it take for scientists to communicate with Opportunity on its landing day? (Assume the communication is a one-way transmission like in part (a).) min

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