The task is to generate the correct answer for a given math problem.

[EX Q]: Problem: a 9 % stock yields 8 % . the market value of the stock is :
[EX A]: rs . 112.50

[EX Q]: Problem: a train traveling at 72 kmph crosses a platform in 33 seconds and a man standing on the platform in 18 seconds . what is the length of the platform in meters ?
[EX A]: 300 meters

[EX Q]: Problem: in triangle pqr , the angle q = 90 degree , pq = 4 cm , qr = 8 cm . x is a variable point on pq . the line through x parallel to qr , intersects pr at y and the line through y , parallel to pq , intersects qr at z . find the least possible length of xz
[EX A]:
3.2 c