book Maths Puzzle Numerical Ability

how far will a wheel with a radius of 35in travel in one turn

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I really need help please I do not get this problem at all:

The time t in hours, that a storm will last is given by the formula t= square root of d cubed over 216, where d is t How many kilos of hard candies that is worth PHP 210 per kilo must be mixed with 12 kilos of chewy candies that is worth PHP 240 per kilo to produce an assortment of goodies that is worth PHP 230 per kilo?