The minute hand goes 6 degrees a minute and the hour hand goes 0.5 degrees.

Suppose the current time is 10 point x minutes.

After 6 minutes, the degree of the minute hand is 6[X+6].

Three minutes ago, the degree of clockwise hand (from 12) was: 10*30+[X-3]*0.5.

When two needles are in a straight line, there are:

6[X+6]+ 180 = 10 * 30+[X-3]* 0.5

X= 15

10 point 15 point