15X= 12(9-X)

The solution is X=4.

4 *15 = 60km

2.(250-2 10) divided by (25-23) = 20m (speed/second)

20 * 25-250 = 250m (Commander A)

64.8* 1000 divided by 3600 = 18m

(320+250) divided by (18+20)= 15 seconds.

3.2 People * * * walk three full distances, 2 1*3 divided by 3=2 1 km.

(1+9 divided by 3) divided by 2 = 12km.