How many nanoseconds does it take for a computer to perform one calculation if it performs calculations per second?

I believe the correct question is:

6.7*10^7 calc/sec?

So:

1 / (6.7 x 10^7) = seconds per calculation

1 / (6.7 x 10^7) = 100 / (6.7 x 10^9) = 14.9 x 10^-9 seconds per calculation = 14.9 ns

Which is approximately 15 ns

Answer:

15 ns