book Maths Puzzle Numerical Ability

Ive been trying to work on this problem forever and now i need some help.
The problem is:
Two friends are 60 miles apart. They decide to ride their bicycles to meet each other. S

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book Other Question
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"five less than twice a number is ten more than the product of four and the number" Let T be a linear operator in V. Prove that T^2 = 0 if and only if the range T is a subset of null T.