each vs. all

[navi tasan]

1-How much time will it take to watch each of these films?

2-How much time will it take to watch all of these films?

Do these sentences mean the same thing?

Could one use '1' instead of '2'?

Gratefully,
Navi.

 

[emsr2d2]

They don't mean the same thing.

The first means "What is the length of each one of these films individually?" and the second means "What is the total length of time of all these films added together?"

 

[Barb_D]

Please give more complete thread titles.
"Each/all of these films" for example.

Let's say you have four films all around two hours in length.

The answer to the first question could be "About two hours" but my sense is the person asking meant in total. I'd ask a clarifying question. "Individually or in total?"

The answer to the second is only "About eight hours."

How long will it take to watch any one of these?

 

[Roman55]

I am not a teacher.

If the question were, "How much time will it take to watch these films?" I would assume this meant the total length of all of "these films".

There is still room for misunderstanding, but this should be removed by the addition of "each of" or "all of".

They ought to dispel the ambiguity, not add to it.

 

[Tdol]

The answer to the first question could be "About two hours" but my sense is the person asking meant in total.

It is ambiguous, but I would also think about 8 hours is more likely to be the answer they're after.