What is the value of x?

x=4

Step-by-step explanation:

<K=30 degrees so LJ=4V2

LM=JM=x

so x^2+x^2=(4V2)^2=16*2=32

   2x^2=32

   x^2=16

   x=4

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