A) 35 m
B) 17.5 m
C) 25 m
D) 18 m
Correct Answer: C
Solution :
Let BC be the wall and AS be the ladder. |
Then, BC = 20 m and AC = 15 |
\[\therefore \] \[A{{B}^{2}}=B{{C}^{2}}+A{{C}^{2}}={{(20)}^{2}}+{{(15)}^{2}}\] |
\[=(400+225)=625\] |
\[\therefore \] \[AB=\sqrt{625}=25\,\,\text{m}\] |
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