Rosemary, Leah and Josh walk a total distance of 42 kilometres to raise money for charity. Josh walks one-third of the distance and Leah walks one-quater of the distance.

a) How far does each person walk?

b) What fraction of the total distance does Rosemary walk?

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I don't need the answer. I'd just like to know as to weather i have the right method.

Do i multiply the distance, (that the people have walked) by the shown distance out of the 42 kilometres? what equation(s) would i use to solve (a) and (b)??