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Answer :
Given, time taken by signal to reach ground = 5 min = 5×60 = 300 s
and speed of signal was \( 3 × 10^8\) m/s.
We know that, speed = \( Distance \over time \) => distance = speed × time
So, Distance \( = 3×10^8 × 300 = 9 × 10^{10} \) m