Here is the question:
The instructions were to think about how we thought about the problem. Below are my ideas, including things I did wrong! My thinking is in red and the maths is in blue.
Was there a way to do this without so much algebra?
2 comments:
What a wonderful problem! I'm fairly certain I've seen it before, but equally certain that I can't remember where. I'm a bit late to the party but...I thought about this in terms of "velocity"-time graphs, so horizontal lines and areas of rectangles. I think the equivalent kinematics problem would look something like: "Car A passes at point P, travelling at constant speed. Some time later, Car B and Car C pass P. B, travelling at 20u, overtakes A after 30 days. C, travelling at 30u, overtakes B after 15 days." Perhaps I will try rewriting some kinematics problems in terms of other rates for when my class revises v-t graphs later this year.
Blutick
Maths With Confidence
Online Maths Teaching
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