Comprehension Passage
Directions: Answer the questions based on the information given below.
In the following question, three wrong number series I, II, and III are given.
Series (I): 257, 329, 405, 491, 585, 687
Series (II): 768, 754, 716, 652, 552, 408
Series (III): 3, 18, 82, 413, 2069, 10350
Correct terms in place of wrong number of series (I), (II), and (III) are represented by (x3 - z2), (y3 + 23), and z2.
Pipe 'X' can fill a tank in '3z' hours and pipe 'Y' can empty the tank in '2y' hours. Both the pipes are opened at 6 A.M. and after some time, pipe 'Y' is closed. If the tank is full at 8 P.M. then find the time at which pipe 'Y' was closed?
1
9 A.M.
2
9 : 30 A.M.
3
10 A.M.
4
10 : 30 A.M.
5
11 A.M.