GATE Civil Engineering (CE) 2017 Shift 1 Solved Paper

The ordinates of a 2-hour unit hydrograph for a catchment are given as
Time (h)                               0              1              2              3              4
Ordinate (m³/s)                    0              5              12           25           41
The ordinate (in m³/s) of a 4-hour unit hydrograph for this catchment at the time of 3 h would be ________