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55% (02:24) correct
45%
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A comet travels at a speed of 250,000 kilometers per hour. Approximately many seconds does it take to travel 30 centimeters?
A) \(4.3 \times 10^{-8}\) seconds
B) \(4.3 \times 10^{-6}\) seconds
C) \(4.3 \times 10^{-5}\) seconds
D) \(2.6 \times 10^{-4}\) seconds
E) \(4.3 \times 10^{0}\) seconds
A) \(4.3 \times 10^{-8}\) seconds
B) \(4.3 \times 10^{-6}\) seconds
C) \(4.3 \times 10^{-5}\) seconds
D) \(2.6 \times 10^{-4}\) seconds
E) \(4.3 \times 10^{0}\) seconds
10 Apr 2026, 10:56
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kevincan
\(250,000\) kms\( = 250,000 *1000 *100\) cms
\(1\) Hour \(= 60*60\) s
\( \frac{ 250,000 *1000*100}{ 60 *60 } = \frac{ 25*10^7}{ 36 }\)
This means that the comet travels \(25 * 10^7 \)cms in \(36\) seconds.
We can form a ratio to find the time comet will take to travel \(30\) cms.
\(\frac{ 25* 10^7}{ 36 } = \frac{30}{ t}\)
\(t=43.2 * 10^{-7}s\) or \(t = 4.3 * 10^{-6}s\)
Ans B
Hope it helped.
