exam Maths Puzzle Numerical Ability

(4x^-2/3y^5)^-1

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exam Other Question
A bicyclist and a hiker leave the same place at the same time and travel in the same direction. The bicyclist travels three times as fast as the hiker. At the end of 3hr they are 24 miles apart. How fast does the hiker travel. Can anyone solve the following?

27< 4|y + 9|-9



Thanks so much