Answer
30 km/h, or 30 kph.
Work Step by Step
$$\frac{15 km}{30 min}\times\frac{60 min}{1 h}=30\frac{km}{h}$$
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 3 - Reading Check Questions (Comprehension) - Page 52: 4
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