Amar moved 20km towards east in car from his home to reach hospital. From there he turned left and moved 30km and again moves 20km right to reach his school. How far is his school from his home?
Let us represent the given statements diagrammatically.
Applying Pythagoras theorem, we get the distance between home and school to be $$\sqrt{30^2 + 40^2}$$
                       = $$\sqrt{2500}$$
                       = $$50 km$$
Therefore, option B is the right answer.
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