﻿ Assuming that be petrol burnt in a motor boat varies as the cube of its velocity, the most economical speed when going against a current of ckm/hr is  : Kaysons Education

# Assuming That Be Petrol Burnt In A Motor Boat Varies As The Cube Of Its Velocity, The Most Economical Speed When Going Against A Current Of ckm/hr Is

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## Question

### Solution

Correct option is

(3c/2 km/hr)

Economy for speed = average speed per litre of petrol burnt.

Let relative speed of the boat = v km/hr

and absolute speed of the boat = (v – c) km/hr

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