Time to tests mathmaticians

Step-by-step explanation:

coordinates of A,B,C are A(5,15),B(15,5),C(20,10)

AB=√((15-5)²+(5-15)²)=√(100+100)=√200=10√2

BC=√((20-15)²+(10-5)²)=√(25+25)=√50=5√2

AC=√((20-5)²+(10-15)²)=√(225+25)=√250=5√10

Perimeter=10√2+5√2+5√10=15√2+5√10≈37 units

probability for j is 1/4

while

a is 1/6

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