A test of a driver$$s perception$/$reaction time is being conducted on a special testing track

with $3\%$ downhill, wet pavement, and a driving speed of $50$ mi$/$h$.$ When the driver is sober,

a stop can be made just in time to avoid hitting an object that is first visible $400$ ft ahead.

After a few drinks under exactly the same conditions, the driver fails to stop in time and

strikes the object at a speed of $35$ mi$/$h$.$ Determine the driver$$s perception$/$reaction time

before and after drinking. $($Use a deceleration rate of $11\mathrm{.}2$ ft$/$s$^2.)$

Need to check my work am little confused on wet payvement and dowgrade.