While passing between earth moon a spacecraft is located


Can you please help me figure out what to do in this equation and why?

While passing between Earth & Moon, a spacecraft is located on line connecting centers of two bodies and is at a distance of d=102km from radio antenna on surface of Earth. The distance from antenna to the Moon is denoted by dm. Recall that speed of light is 3.0x108 m/s.

How long, in seconds, does it take for signal from spacecraft to arrive at antenna on Earth?

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Physics: While passing between earth moon a spacecraft is located
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