An intense rain is falling uniform of 7.5 cm/hour for a period of 60 minutes on a basin whose area is 500 hectares. If the average infiltration capacity during the entire rain period is assumed to be 1.5cm/hour, the maximum run off rate based on 10 minute peak percentage of 16% from distributing graph of the basin is
A40 сumecs
B60 сumecs
C80 cumecs
D100 cumecs