Question

If the petrol burnt in driving a motor boat varies as the cube of the velocity, then the speed (in km hom ) of the boat going against a water flow of C kms hour so that the quantity of petrol burnt is minimum is

• A. $\frac{2C}{3}$
• B. $\frac{3C}{2}$
• C. $\frac{4C}{3}$
• D. $\frac{3C}{4}$

Answer 1

Answer: (B)

Correct answer is (b) $\frac{3C}{2}$