Question by Summer Clouds - Discuss with MathYouLike

Summer Clouds moderators

03/11/2017 at 08:51

A girl and a boy are walking side by side. A girl steps onto a moving walkway and walks at the same speed while a boy walks alongside at his constant speed. When the girl reaches the end, the boy has covered only two-fifths of the length of the walkway. What is the ratio of the walkway's rate to a girl and a boy's walking speed?

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Lê Quốc Trần Anh Coordinator 03/11/2017 at 17:56

The boy has covered only two-fifth way => The total speed of the girl and the moving walkway is: \(\dfrac{5}{2}\)

So the ratio of the walkway's rate to the girl's rate (sililar to the boy's rate) is: \(\dfrac{5}{2}-1=\dfrac{3}{2}=3:2\)

ANSWER: \(3:2\)
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Phạm Tuấn Đạt 05/11/2017 at 06:37

The boy has covered only two-fifth way => The total speed of the girl and the moving walkway is: \(\dfrac{5}{2}\)

So the ratio of the walkway's rate to the girl's rate (sililar to the boy's rate) is: \(\dfrac{5}{2}-1=\dfrac{3}{2}=3:2\)

ANSWER: 3:2

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