A) 1 km
B) 5 km
C) 6 km
D) 12 km
Correct Answer: B
Solution :
Route followed by Ravi, |
By Pythagoras theorem, |
\[AC=\sqrt{{{(AB)}^{2}}+{{(BC)}^{2}}}\] |
\[=\sqrt{{{(3)}^{2}}+{{(4)}^{2}}}\] |
\[=\sqrt{9+16}\] \[=\sqrt{25}=5\,km\] |
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