Doubt from probability

#1

Q) On a straight line of length a two points are taken at random; find the chance that the distance between them is greater than b.
Q) A straight line of length a is divided into three parts by two parts taken at random; find the chance that no part is greater than b.
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Thanks.

#2

Anyone ?

#3

For first it must be 1-b/a

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#4

First answer is((a-b) /a) ^2

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#5

Start from pic 2

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#6

Great @Shiva_1 sir
2nd one also