A voyager forever voyaging

First of all , we must change from $18.5$ billion km to m , and we got $18.5$ trillion m

or $1.85 \times 10^{13} m$

the question is how long does it take in seconds ,it means we must find "time." ( $T$ )

$T=\frac {s}{v}$ , radio signal speed = speed of light so , we can write

$T=\frac {1.85 \times 10^{13} m}{3 \times 10^{8} m/s}$

cause the unit must be seconds , we can eliminate meter unit. meter/meter equals 1 so

$T=\frac {1.85 \times 10^{13}}{3 \times 10^{8} 1/s}$

$T=\frac {0.61667 \times 10^{5}}{\frac{1}{s}}$ , $T= 61667 s$ , so the answer is $\boxed{61667}$

s = 18.5 billion km.

c = 3 x 10^8 m/s.

t = s/c

t = 18.5 billion km / (3 x 10^8 m/s).

t = 61666.667 s

It is widely known that $Speed = \tfrac{Distance}{Time}$ . After a mere substitution, we get that $3 * 10^8 m/s = \dfrac{18.5 * 10^9 * 10^3 m}{X s} \Rightarrow X = 61667 s$ .

time = distance/rate

1.85x10^9 km = 1.85x10^13m

t = 1.85x10^13m/ 3x10^8 m/s = 0.6166 x 10^5 = 6.166 x 10^5

just only a simple problem... to get the right answer you must need to know conversion method

18.5 billion km = 18.500.000.000 km = 18.500.000.000.000 m

3x10^8 m/s = 300.000.000 m/s

18.500.000.000.000 m / 300.000.000 ms = 61666.66667 s

time = distance / speed , time = (18.5E12) / 3E8 = 61667.667

We must know if t = s/v, so t = 18.5 x 10^12 m / 3 x 10^8 m/s = 61666,66667 seconds = 6.1667E+4 (ANSWER)

$Time = \frac{Distance}{Speed}$

So, there is Total Distance = $18.5 * 10^9 km \implies 18.5 * 10^{12} m$

And, Speed = $3 * 10^8 m/s$

So, total time is second it will take = $\frac{18.5 * 10^{12} }{3 * 10^8} \implies 61667$ s [approx]

We need to convert 18.5 billion km to seconds. We already have a rate to convert it–the speed of light.

$18.5 \times 10^{9} km \times \frac{1 sec}{3 \times 10^{8} m} =$

$18.5 \times 10^{9} km \times \frac{1 sec}{3 \times 10^{5} km} =$

$\frac{18.5 \times 10^{9} sec}{3 \times 10^{5}} =$

$\frac{18.5}{3} \times \frac{10^{9}}{10^{5}} sec =$

$6.1667 \times 10^{4} sec =$

$\boxed{61667 sec}$