If two runners running a 10k race start at the same time but runner A runs at 4.39m/s and runner B runs at 4.27m/s what will be the distance between the runners at the end of the race?

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?