Question

The time 3and 1 by 2

hours before 2:20 p.m. is​

Answer 1

Step-by-step explanation:

Explanation:

You have a mixture of units of measurement so lets change them so that they may be compared directly. Using the 24 hour clock

Consider 2:12 am.

Note that:

If you remove 712 hours from this you end up in the previous evening so lets do a sort of cheat.

Building the time reference point for 2:12 am

A full day on the 24 hour clock is 24. Then to get to 2:12 am you have an additional 2 hours 12 minutes giving a total time of

24+2 hours+12 minutes from 2 midnights ago

Shifting 1 of the hours into the minutes gives:

Write this as 23+2 hours+60+12 minutes

This gives us: 25 hours +72 minutes

Subtract from this the 712 hours written as 7 hours + 30 minutes

25 hours+72 minutes

27 hours+30 minutes−−−−−−−−−−−−−−−−−−−−−← Subtract

18 hours+42 minutes

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1800 hours is 18−12→6 pm ← converting back to 12 hour clock

So the time is 6 pm+42 minutes

Writing this in the same format as the in the question we have:

6:42 pm

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