The graph shows the speed of Sam's car over time. Which best describes what is happening in section C?
Speed of Car
His car is stopped
His car is speeding up.
His car is slowing down.
His car is traveling at a constant speed.
B
Speed (mph)
С
D
Time (hours)
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b.an increase in a causes b to decrease

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.