Big City School District voted to increase the length of the school day for students. The school day used to be 420 minutes, but is now 441 minutes. What is the percent increase in the school day? 4.8% 5% 21% 50%

option: d is correct

step-by-step explanation:

1 is c

2 is a

3 is a

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.