William can eat 3 slices of pizza in 5 minutes. If he continues to eat at the same rate, how long will it take him to eat the whole pizza, which has 12 slices of pizza? How many slices can he eat in half of an hour?

William can eat 18 slices of pizza in half of an hour.

William can eat a whole box of pizza in 20 minutes.

Step-by-step explanation:

30 minutes in half of an hour, 30/5 is 6.

3 slices in 5 mins

3 times 6 is 18.

3 slices --->   12 slices

              x4

5 mins--->   20 mins

           x4

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.