Evaluate
\frac{15000k}{19ns}
Differentiate w.r.t. k
\frac{15000}{19ns}
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\frac{3\times 10^{5}km}{s\times 380nm}
Express \frac{\frac{3\times 10^{5}km}{s}}{380nm} as a single fraction.
\frac{3\times 10^{5}k}{380ns}
Cancel out m in both numerator and denominator.
\frac{3\times 100000k}{380ns}
Calculate 10 to the power of 5 and get 100000.
\frac{300000k}{380ns}
Multiply 3 and 100000 to get 300000.
\frac{15000k}{19ns}
Cancel out 20 in both numerator and denominator.
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