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Alice made a telephone call from her home telephone in New York to her fiance stationed in Baghdad, about 10,000km away, and the signal was carried on a telephone cable. The following day, Alice called her fiance again from work using her cell phone, and the signal was transmitted via a satellite 36,000 km above the Earth's surface, halfway between New York and Baghdad. Estimate the time taken for the signals sent by

(a) the telephone cable and

(b) via the satellite to reach Baghdad, assuming that the signal speed in both cases is the same as the speed of light, c. Would there be a noticeable delay in either case?

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