question_answer

Ravi started walking from his houses towards East direction to bus stop which is 3 km away. Then, he set-off in the bus straight towards his right to the school 4 km away. What is the crow flight distance from his house to the school?

A) 1 km                            

B) 5 km

C) 6 km                            

D) 12 km

Correct Answer: B

Solution :

Route followed by Ravi,

By Pythagoras theorem,

\[AC=\sqrt{{{(AB)}^{2}}+{{(BC)}^{2}}}\]

\[=\sqrt{{{(3)}^{2}}+{{(4)}^{2}}}\]

\[=\sqrt{9+16}\] \[=\sqrt{25}=5\,km\]