Final answer:
Without knowing the distance that Whitney runs, we cannot calculate the exact distance that Jack runs; however, Jack runs 7 tenths of a kilometre further than Whitney.
Step-by-step explanation:
To find out how far Jack runs, we need to know how far Whitney runs and then add 7 tenths of a kilometre to that distance. Unfortunately, the provided information does not specify the actual distance Whitney runs; therefore, we cannot calculate Jack's distance with the given data. If Whitney's running distance was provided, we would add 0.7 km to that distance to find out Jack's distance. For example, if Whitney runs 3 km, Jack runs 3 km + 0.7 km = 3.7 km.