The rectangular cistern (storage tank for rainwater) shown has its top 15 ft below ground level. The cistern, currently full, is to be emptied for inspection by pumping its contents to ground level Assume that the water weighs 62.3 lb/ft³ Complete parts (a) through (d) below How much work does it take to empty the tank? (Round to the nearest integer as needed.) 0 15 25 11 ft 1 b. How long will it take a -hp pump, rated at 375 ft-lb/sec to pump the tank dry? Ground level 10 ft 20 ft minutes (Round to the nearest integer as needed) c. How long will it take the pump in part (b) to empty the tank halfway? (It will be less than half the time required to empty the tank completely.) minutes (Round to the nearest integer as needed)

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