8 - Cheapest Travel Plan

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You have a car that runs on both petrol and diesel. The prices of petrol and diesel per unit volume are $P_p$ and $P_d$ respectively. Using one unit volume of fuel, you can travel one unit distance. The petrol tank of your car has a capacity $C_p$ units. (It means that at any instant, your car can store no more than $C_p$ volume of petrol. The diesel tank of your car has a capacity $C_d$. There

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