A student rides on bicycle at 8 km/hr and reaches his school 2.5 min late. The next day he increase his speed to 10km/hr and reaches his school 5 min early . How far is the school from his house.
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Then the next day he increases his speed by 15 km/hr but still he is late by (8 min = 8/60 =) 2/15 hr
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