# science

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A space probe of the surface of Mars sends a radio signal back to the Earth, a distance of 3 x 1010 km. Radio waves travel at the speed of light (3.00 x 108 m/s).
How far away is the space probe?
How many seconds does it take for the signal to reach the Earth?
How many hours is this?

• science -

3E10 km x (1000 m/1 km) = 3E13 meters.

distance = rate x time.
3E13 = 3E8 x time.
Solve for time in seconds.

?sec x (1 min/60 sec) x (1 hour/60 min) = ?hours.

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