A cyclist rode 20 km. For the first 10 km his average velocity was 15 km/h. The remaining distance he traveled with average velocity of 25 km/h. Determine his average velocity over a whole path.
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Answer:
T1 = 10/15 = 2/3 hours .
T2 = 10/25 = 2/5 hours .
Total T = 2/3 + 2/5 = 16/15 hours .
Total D = 20km
average velocity = Total distance / Total time
Ans: = 20/(16/15) = 20*15/16 = 18.75km/h
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