TCS Company Logical Reasoning Blood Relations

I have heard tcs is asking questions from arun sharma this year. So plz tell me which chapter of arub sharma quantitive aptitude is to be followed?

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TCS Other Question

A person drive with constant speed and after sometime he sees a milestone with 2 digits.then aftr one hr, travelling with same speed sees same 2 digit in reverse order.1 hr later,he sees that the milestone has a same 2 digits with 0 in btwn them. what s the speed of the car? I just asked one of my friend who has given tcs test he said me that there is a question give:
A circle is given inside it there are two equilateral triangle which forms a start and said to find the area of the circle where diameter of circle is given my test is on 15 if anybody knows this please tell me how to solve it !!!