$(22)$ A ship moves against a river flow of $1\mathrm{.}5f\frac{t}{sec}.$ Its speed $V$ with respect to the water is $8$ knots. Let:

$L=400ft,B=60ft,T=20ft,C_B=0\mathrm{.}72,$ eta $=$ transmission efficiency $=0\mathrm{.}75,sfc=0\mathrm{.}3lbs.$ fuel $\frac{?}{shphr}.$

Without its payload the ship weighs $2800$ tons. Find:

a$.(3)$ The net speed of advance

b$.(3)$ Loaded displacement

c$.(3)$ Wetted area

d$.(8)$ Resistance $($Assume the river is $250ft$ wide and $32ft$ deep.$)$

e$.(5)$ Fuel efficiency $($in net ton miles$/$ lb fuel$)$