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Ans 1:
Class : Class 6
If the mirror is placed at any other place except D, none or only one car can see the other cars coming towards each other. When it is placed at D, both of the cars can see the other car coming towards each other and prevent an accident.
Ans 11:
Class : Class 5
If the mirror is at position D, then both the cars' passengers can see each other coming and take necessary precaution to avoid the accident.