Write one or two paragraphs giving reasons for choosing a particular method of solving the following problem. If a first pump is used for 2.2 h and a second pump is used for 2.7 h, 1100 ft³ can be removed from a wastewater-holding tank. If the first pump is used for 1.4 h and the second for 2.5 h, 840 ft³ can be removed. How much can each pump remove in 1.0 h? (What is the result to two significant digits?)