Answer:
28 mph
Explanation:
Given that a car moving 36 mph takes 7 hours for a trip, you want to know the speed if the trip takes 9 hours.
Time and Speed
The speed and time vary inversely for the same distance. If the time goes up by a factor of 9/7, the speed will go down by the inverse factor: 7/9.
7/9 × 36 mph = 28 mph
The speed of the car is 28 mph for the 9-hour trip.
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