If a runner has a power output of 150 w over 10.0 s, then how much work does she do?

The amount of work done by a certain body is the product of the power given and the time. Mathematically,
                                        Work = Power x time
Substituting the known values,
                                      Work = (150 W) x (10 s)
                                                = 1500 N.m 
                                                = 1500 J