question_answer

                                        Two 26 m strings are tied to a concrete pedestal between two poles having heights of 24 m and 25 m respectively. What is the distance between the poles? (Consider the top of pedestal to be on the same level as the base of the poles).

A)  15 m                           

B)  21 m         

C)  17 m     

D)  28 m

Correct Answer: C

Solution :

(c): Mental thinking is important here. The moment you draw the figure, you have solved the problem. \[\Rightarrow \]   \[x=\sqrt{{{26}^{2}}-{{24}^{2}}}=10\]             Similarly, \[y=7\] \[\Rightarrow \]   \[x+y=17\,m\]