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If a person walks at 14 km/hr instead of 10 km/hr, he would have walked 20 km more. The actual distance travelled by him is:

50 km
56 km
70 km
80 km
Explanation:

Let the actual distance travelled be x km.
Then,
$\dfrac{x}{10}=\dfrac{x + 20}{14}$
=>14x = 10x + 200
=>4x = 200
=>x = 50 km.
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