solve bith subparts and kindly do nit provide ai generated solution and provide $100\%$ accuracy

On a highway level paved surface, three vehicles are travelling in three lanes: $2016$ Nisan Leaf with frontal area $22$ square $ft$ and weight $2200lb$; $1987$ Ford Taurus with frontal area $18$ square $ft$ and weight $2000lb$ and $2002$ Acura NSX with frontal area $20$ square $ft$ and weight $2100lb.$ All these three vehicles pass the tunnel with same tractive effort of $150lb.$ Which vehicle is travelling fastest, and which one is the slowest?

Following previous problem $($mentioned in $3^{rd}$ question$),$ if maintaining the same speed with $15HP$ available tractive power, are all these vehicle will be able to move safely over a $5\%$ grade uphill road? $($for this particular question, assume the air density is $0\mathrm{.}002$ slugs $\frac{?}{f{t}^3}).$