The sum of 5 and 12 is 7 if and only if
a.) 12 is divisible by 5
b.) 12 is greater than 5
c.) 5 is even
d.) the difference of 12 and 5 is -7

answer:  

123455421

step-by-step explanation: easy

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.