Question

а A clock hung on a wall of a hall has marks instead of numerals on its dial. On the opposite wall, there is a plane mirror and the image of the clock in the mirror indicates the time 7.40. hence, the time on the clock is​

Answer 1

Answer:

5:20

Explanation:

in the original clock the time is 5:20 because in clock if time is fractional (8:40 etc.) then the image time in mirror is 11:60-8:40=3:20. and if the time is acute like 7:00 etc. then minus the time from 12:00 and you get the image time that held in mirror.