To cover a distance of 81 km in 1.5 hours what should be the average speed of the car in meters/second?
15
Step 1 — Average speed in km/h:
\[\text{Speed}=\frac{81}{1.5}=54\text{ km/h}\]
Step 2 — Convert to m/s using \(1\text{ km/h}=\tfrac{5}{18}\text{ m/s}\):
\[54\times\frac{5}{18}=3\times 5=15\text{ m/s}\]
Therefore the required average speed is 15 m/s.
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