N, at a speed of 20 km/h reaches his office 10 min late. Next time he increases his speed by 5 km/h, but is still late by 4 min. What is the distance of office from his house?
1) 6 km
2) 20 km
3) None of these
4) 12 km
aditjain1980:
is the answer (C)
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3) none of these....................
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none of these option three
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