What is the maximum speed $($to the nearest $5mph)$ at which the $"$SSD for design" standard is maintained? $7\mathrm{.}15.$ Vertical Alignment and Design Speed. A $600-$foot crest vertical curve is to be developed from a plus $1\mathrm{.}70$ percent grade intersecting with a minus $3\mathrm{.}3$ percent grade at station $15+60\mathrm{.}00$ at an elevation of $312\mathrm{.}88.$

A$.$ Find the station and elevation of the peak of the curve.

B$.$ Is the curve long enough for a design speed of $60mph?$ Why or why not?