Discussion
Ravi started walking from his house east direction on Bus stop which is 3km.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?
Answer: B
Correct answer: 5 km
The two legs are at right angles - east 3 km, then a right turn onto south for 4 km - so the straight-line distance is the hypotenuse: \[ \sqrt{3^2+4^2} = \sqrt{9+16} = \sqrt{25} = 5\ \mathrm{km}. \] The 7 km offered is the distance actually travelled along the roads, which is what the phrase “as the crow flies” exists to exclude.
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