Starting from his house one day, a student walks at
speed of 5/2 kmph and reaches his school 6 minutes late.
Next day he increases his speed by 1 kmph and reaches
the school 6 minutes early. How far is the school from his
house?
(a) 1 km
(b) 15 km
(c) 7/4 km
(d) 3 km
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