1. **State the problem:** We want to find the exact time between 10:00 and 11:00 such that six minutes from now, the minute hand is exactly opposite the position where the hour hand was three minutes ago.
2. **Define variables:** Let the current time be $10:x$ minutes.
3. **Positions of hands:**
- The hour hand moves $0.5$ degrees per minute (since it moves 30 degrees per hour).
- The minute hand moves $6$ degrees per minute.
4. **Calculate hour hand position 3 minutes ago:**
The hour hand position at time $10:x$ is:
$$H = 30 \times 10 + 0.5 \times x = 300 + 0.5x$$ degrees.
Three minutes ago, the hour hand was at:
$$H_{-3} = 300 + 0.5(x - 3) = 300 + 0.5x - 1.5 = 298.5 + 0.5x$$ degrees.
5. **Calculate minute hand position 6 minutes from now:**
The minute hand position at time $10:x$ is:
$$M = 6x$$ degrees.
Six minutes from now, the minute hand will be at:
$$M_{+6} = 6(x + 6) = 6x + 36$$ degrees.
6. **Condition for opposite positions:**
The minute hand 6 minutes from now is exactly opposite the hour hand 3 minutes ago, so their positions differ by 180 degrees:
$$|M_{+6} - H_{-3}| = 180$$
Substitute values:
$$|6x + 36 - (298.5 + 0.5x)| = 180$$
Simplify inside absolute value:
$$|6x + 36 - 298.5 - 0.5x| = |5.5x - 262.5| = 180$$
7. **Solve the absolute value equation:**
Two cases:
Case 1:
$$5.5x - 262.5 = 180$$
$$5.5x = 442.5$$
$$x = \frac{442.5}{5.5} = 80.4545...$$ (not possible since $x$ must be between 0 and 60)
Case 2:
$$5.5x - 262.5 = -180$$
$$5.5x = 82.5$$
$$x = \frac{82.5}{5.5} = 15$$
8. **Check if $x=15$ is valid:**
Yes, $x=15$ minutes is between 0 and 60.
9. **Final answer:**
The exact time now is $\boxed{10:15}$.
Watch Hands Time Ea4D46
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