1/3 of a certain journey is covered at the rate of 25 km/h,1/4 at the rate of 30 km/h and the rest of 50 km/h. What is the average speed for the whole journey?
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Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's metabolic activities .
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