Q: A person covers 20 km with a speed of 12 km/hr and next 30 km with a speed of 20 km/h. What is his average speed for the whole journey in km/h (correct to one decimal place)?
A.
17.6
B.
16.4
C.
16.1
D.
17.2
Correct Answer:
Option C -
Explanations:
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