The Oxygen Consumption (In Milliliter/pound/minute) for a Person Walking at X

Multiple Choice

The oxygen consumption (in milliliter/pound/minute) for a person walking at x mph is approximated by the function where the oxygen consumption for a runner at x mph is approximated by the function At what speed is the oxygen consumption the same for a walker as it is for a runner? What is the level of oxygen consumption at that speed?

A) 3.1 mph, 99.6 mL/lb/min
B) 7.1 mph, 89.6 mL/lb/min
C) 7.6 mph, 94.6 mL/lb/min
D) 4.6 mph, 64.6 mL/lb/min
E) 5.6 mph, 74.6 mL/lb/min