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A man covers a distance of 20 km in 3.5 hours partly by running and partly by walking. If he walks at 4 kmph and runs at 10 kmph, find the distance he covers by walking. | |
A. | 10 km [Correct Answer] |
B. | 8 km [Wrong Answer] |
C. | 12 km [Wrong Answer] |
D. | 9 km [Wrong Answer] |