The daily wages (in rupees of 25 labouriers engaged in factory. 152 , 173, 192 ,214,232,251,165,180,195,218,241,264,168,185,198,213,247,259,200,225,235,205,227,236,208
Water is running out of a conical funnel at the rate of 15 cm^3/sec.if the radius of the base of funnel is 10cm and altitude is 20cm, find the rate of which water level is dropping when it is 10cm from the top.