Darts are thrown at a circular board. If a dart hits the board, what is the probability that it will land on the center circle. **10 is from the center to the edge.
A)1/25
B)1/4
C)1/5
D)3/5

1/25

Step-by-step explanation:

Calculate the area of the centre circle (pi*2^2) and then calculate the area of the whole circle (pi*10^2) and then divide pi*4 by pi*100 which gives you 4/100=1/25

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m