The car drove the first half of the way at a speed of 60 km / h the second at a speed of 90 km / h. Find the average speed.

univerkov | December 11, 2020 | education

Given:
S (1) = S (2) = S / 2
V (1) = 60 km / h
V (2) = 90 km / h
t = t (1) + t (2)
Decision:
V (cf) = S / t
V (sr) = S / (((s / 2) / 60) + ((S / 2) / 90))) = S / ((S / 120) + (S / 180)) = S / (5S / 360) = 72 km / h
Answer: 72 km / h

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