The sum of two numbers is 18, and the product of these two numbers is 56.
What are the numbers?

-14 and -4

Step-by-step explanation:

x+y=18

xy=56 solving simultaneously, x=56/y

56/y + y = 18

step-by-step explanation:

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.