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To find the ascent rate in kilometers per hour (kph), we divide the distance ascended (3/4 kilometer) by the time taken (1/16 hour).
(3/4) km รท (1/16) hr = (3/4) km ร (16/1) hr = 3 km ร 16/4 = 12 km/hr
Therefore, the mountain hiker's ascent rate was 12 kph.