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Rob drives to the nearest hospital with an average speed of v m/s in t seconds. If he drives home along the same path at an average speed of 3v m/s, how long does the return trip take, in terms of t?
At/6
Bt/3
C3t
D6t
Answer & Solution
Correct answer: B. t/3
1. The distance covered is the same both ways: d = v x t.
2. On the return trip, time = distance / speed = (v x t) / (3v).
3. The v terms cancel, leaving t/3.
_Source: OpenStax Physics (CC BY 4.0), Ch 2 "Motion in One Dimension", section 2.2 Speed and Velocity_
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