Q4 of 26 Page 100

My aunt reached my maternal uncle’s house in five hours by driving the car at a speed of 40 km/hr. Let’s work out using the Rule of Three method how long it would have taken if she would have drives the car at a speed of 50 k.m/hr.

theorem1:-


The Rule of Three is a Mathematical Rule that allows you to solve problems based on proportions. By having three numbers: a, b, c,


(a)Direct proportions rule of 3:-


if ab


c then


(b)inverse proportions rule of 3:-


if ab


c then


formula:- (i)direct method----


(ii)indirect or inverse proportions xy=k



method used is called indirect or inverse proportions method


speed of car 40km/hr in 5 hour time




now 50km/hr speed will take time




Therefore 4hr is time take at speed of 50 km/hr to reaches houses


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