Had the match gone to the Duckworth Lewis Method after the 15th over:

HCC would have had 25 overs remaining with 3 wickets lost which means they had 56% of resources remaining.

Because it is only a 40 over match each team began with 89.3% of resources.

So HCC's resources are 89.3-56 = 33.3%

HICC's resources at the begining of innings = 89.3%

Revsied target after match was abandoned = (379) * 33.3/89.3 = 141.29 runs or 141 runs to tie, 142 for win.