166.67 kph
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The answer will depend on the speed at which the truck travels.The answer will depend on the speed at which the truck travels.The answer will depend on the speed at which the truck travels.The answer will depend on the speed at which the truck travels.
If that's really what the question is, the answer is 1400 mph. If the question is actually "A truck travels 1400 miles in 20 hours, what is its average speed?" then the answer is 70 mph.
distance = time x speed. Since the speed is expressed in miles per hour, you must convert the 15 minutes to 1/4 hour, to have consistent units. The result is 1/4 hour times 62 mpg = 15.5 miles.
30 kph
It is 45 mph.