An application executes \( 6.4 \times 10^8 \) number of instructions in 6.3 seconds. There are four types of instructions, the details of which are given in the table. The duration of a clock cycle in nanoseconds is ___________. (rounded off to one decimal place)
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\begin{tabular}{|c|c|c|}
\hline
Instruction type & Clock cycles per instruction (CPI) & Number of instructions executed
\hline
Branch & 2 & \( 2.25 \times 10^8 \)
Load & 5 & \( 1.20 \times 10^8 \)
Store & 4 & \( 1.65 \times 10^8 \)
Arithmetic & 3 & \( 1.30 \times 10^8 \)
\hline
\end{tabular}
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