Q: One-fifth of a journey is covered at a speed of 30 km/h, one-fourth of the journey at a speed of 25 km/h and the rest at 60 km/h. What is the average speed (in km/h, correct to one decimal place) for the whole journey?
A.
38.7
B.
30.6
C.
40.5
D.
25.4
Correct Answer:
Option A -
Explanations:
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