a) 2.31 kg/cm²; 0.96 HP
b) 2.11 kg/cm²; 0.86 HP
c) 2.56 kg/cm²; 0.98 HP
d) 3.11 kg/cm²; 0.76 HP

Answer: a
Explanation:

Cross sectional area = \(\frac{1}{2}\)*b*h = \(\frac{1}{2}*15*5\) = 37.5cm²
Unit draft (D_u) = \(\frac{P cosθ}{A} = \frac{100*cos30°}{37.5}\) = 2.31kg/cm²
Power = \(\frac{[Draft (kg)*S (\frac{m}{s})]}{75}\) hp = \(\frac{[P cos30°*3*1000]}{75*60*60}\)=0.96 HP.