# MAth qn

The activity “Ship Container” in your network diagram has an earlystart of day 17, a late start of day 22 and a late finish of day 37. What is the activity duration?

A.) 15 days

B.) 16 days

C.) 59 days

D.) 14 days

Ans given as B. I thought it shoud be A)

I thought duration formula is LF-LS, but they are using LF-LS+1.

can anyone explain?

### The correct way to go about

The correct way to go about this is by using LF-LS = 15. A.

### yes..that's what my

yes..that's what my understanding is. but ans is given as B. not sure when to use 2nd formula as well.

any idea?

### Somewhere, on some wesbite,

Somewhere, on some wesbite, I read that PMI's way of doing things is to NOT add the plus 1.

I think it was on deepfriedbrain and the author also had an official link to the PMI publication that reflected the same.

### Activity Duration

Both the formulas are correct.
You can refer to the following link which explains how to answer the question Activity Duration
If this a complete question the this is a very poorly formed question. The question should have the network diagram. You can also refer to this article for more information on Project Network Diagram