Xét tính chất phản xạ, đối xứng, phản xứng, bắc cầu của quan hệ 2 ngôi sau: Cho X = R
a) a T b <=> 2a + 3b < 1500
b) a H b <=> 2a < 3b + 15

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.

a - base

b - exponent

so,

but which class are u may know that first

step-by-step explanation:

is their an equation anywhere i can take a   look at it and see if i am right.