139 students choose to attend one of three after school activities: football, tennis or running. There are 66 boys.

56 students choose football, of which 28 are girls.

54 students choose tennis.

18 girls choose running.

A student is selected at random.

What is the probability this student chose running?

Give your answer in its simplest form.

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.