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20ns / (5 x 10^-10) = ?s

The answer's 40s. Now how do I get to that? I would really like to see the step by step process if possible.
Eien no Melody
20ns / (5 x 10^-10) = ?s

The answer's 40s. Now how do I get to that? I would really like to see the step by step process if possible.


Getting beyond the basics, there are two key factors you need to be aware of
1) How exponents work when they are positive vs negative.
2) Converting between different units

A positive exponent is how many times your multiplying by the number (ie 10^2 = 10*10, 10^3 is 10*10*10)
A negative exponent indicates how many times to divide by the number. (ie 10^-2 = 10/10, 10^-3 is 10/10/10)

So, 10^-10 = 0.0000000001

5 * 0.0000000001 = 0.0000000005

20 / 0.0000000005 = 40000000000

1 second = 1,000 microseconds
1 second = 1,000,000 milliseconds
1 second = 1,000,000,000 nanoseconds

Therefore, 40000000000 / 1000000000 = 40

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