A) 12
B) 15
C) 16
D) 18
Correct Answer: C
Solution :
by similar triangle \[\frac{h}{{{x}_{1}}}=\frac{80}{{{x}_{1}}+{{x}_{2}}}\] ?(1) by\[\frac{h}{{{x}_{2}}}=\frac{20}{{{x}_{1}}+{{x}_{2}}}\] ?(2) by (1) and (2) \[\frac{{{x}_{2}}}{{{x}_{1}}}=4\]or\[{{x}_{2}}=4{{x}_{1}}\] \[\Rightarrow \]\[\frac{h}{{{x}_{1}}}=\frac{80}{5{{x}_{1}}}\]or\[h=16m\]You need to login to perform this action.
You will be redirected in
3 sec