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A radar signal is beamed towards a planet and its echo is recived 7 minutes later. If the distance between the planet and earth is `6.3xx10^(10)m,` calculate the speed of the signal.

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The correct Answer is:
`3xx10^8 m//s`
`t = 7min = 7xx60s, x =6.3xx10^(10)m, upsilon = ?`
`As upsilonxxt = x+x.`
`upsilon = (2x)/(t) = (2xx6.3xx10^(10))/(7xx60) = 3xx10^8m//s`
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