Answer:-
Given:-
Distance between Earth and Mars (d) = 57.50 million kilometers
As we know that
1 million kilometers = 1000000 kilometers = 1000000 km
then
57.50 million kilometers = 57.50 1000000 km
57.50 million kilometers = 57500000 km
Also we know that
1 km = 1000 m
then
57500000 km = 57500000 1000 m
57500000 km = 57500000000 m
So
Distance between Earth and Mars (d) = 57500000000 m = 575 108 m
time (t) =?
Since we know that radio signal is electromagnetic radiation therefore its velocity or speed is equal to the speed of light therefore
speed of radio signal (v) = 3.0 108 m / sec
So according to the formula
speed (v) = distance(d) / time(t)
or
time(t) = distance(d) / speed (v)
therefore
time(t) = Distance between Earth and Mars (d) / speed of radio signal (v)
time(t) = 575 108 m / 3.0 108 m / sec
time(t) = 191.67 sec
Since we know that
60 second = 1 minute
1 second = 1 / 60 minute
then
191.67 sec = 191.67 1 / 60 minute
191.67 sec = 3.19 minute
So 3.19 minutes would radio signal sent from a future manned mission to Mars take to travel to Earth.
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