rakman123 wrote:
On June 8, 2008, a computer set a speed record by completing arithmetic operations at a rate of approximately 1.026 x 10^15 operations per second. At this rate, which of the following is closest to the fraction of an hour it would take this computer to complete 1 million mega-operations, if 1 mega-operation is defined to be 1 million arithmetic operations?
A) 3 x 10^-13
B) 6 x 10^-13
C) 4 x 10^-10
D) 3 x 10^-7
E) 3 x 10^-1
\(1 million = 10^6\)
\(1 mega-operation = 10^6\)
\(1 million- mega-operations = 10^6 * 10^6 = 10^{12}\)
It does \(1.026 * 10^{15}\) operations per second. We need to do only \(10^{12}\) operations. It will take much less than a second. We need to calculate in hours, which will become even smaller value.
\(Time-taken = \frac{10^{12}}{1.026 * 10^{15}} \frac{operation}{operation- per-second}\)
\(Time-taken = \frac{10^{12}}{1.026 * 10^{15}}\) seconds
So time taken is coming in seconds. To convert it to hours, divide by another 3600 (1 hour = 3600 seconds).
\(Time-taken = \frac{10^{12}}{1.026 * 10^{15} * 3600 } \) hours
I see that the options have digits such as 3, 4 etc. Rest everything is included in the powers of 10.
\(Time-taken = \frac{100 * 10^{10}}{36 * 10^{17} } \) hours (assuming 36 * 1.026 will be very close to 36)
\(Time-taken = \frac{100}{36} * 10^{-7} \) hours
100/36 will be about 3.
Answer (D)
Check out this post on Unit Conversion:
https://anaprep.com/arithmetic-unit-conversion/ _________________
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