A 2-hr storm (2 cm of runoff) of uniform intensity produces the flows on Wolf Creek shown in the following table. Determine the peak flow and time to peak of a 4-hr design storm that generates 1.5 cm of runoff in the first 2 hours and 3 cm of runoff in the subsequent 2 hrs. Assume a negligible base flow.

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Time 0400 0500 0600 0700 0800 0900 1000 100 1200 1300 1400 1500 Q (mfsec) 060 440 920 860 720 580 460 320 10 60 0