Unequal project lives

Newtown Corp. has to choose between two mutually exclusive projects. If it chooses project A$,$ Newtown Corp. will have the opportunity to make a similar investment in three years. However, if it chooses project $B,$ it will not have the opportunity to make a second investment. The following table lists the cash flows for these projects. If the firm uses the replacement chain $($common life$)$ approach, what will be the difference between the net present value $($NPV$)$ of project A and project B$,$ assuming that both projects have a weighted average cost of capital of $14\%?$

$\backslash$table$[[$Cash Flow,$],[$Project A$,$Project B$],[$Year $0$:$,-$$$15,000,$Year $0$:$,-$$$40,000$