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Cost slope of the direct cost curve is given by
1
\(\frac{{{\rm{Crash\;Cost}} - {\rm{Normal\;Cost}}}}{{{\rm{Normal\;Time}} - {\rm{Crash\;Time}}}}\)
2
\(\frac{{{\rm{Crash\;Cost}} - {\rm{Normal\;Cost}}}}{{{\rm{Crash\;Time}}}}\)
3
\(\frac{{{\rm{Crash\;Cost}} - {\rm{Normal\;Cost}}}}{{{\rm{Normal\;Time}}}}\)
4
\(\frac{{{\rm{Normal\;Cost}} - {\rm{Crash\;Cost}}}}{{{\rm{Crash\;Time}}}}\)