This Diagram Shows a Place Underlain by Uniform Materials

Short Answer

This diagram shows a place underlain by uniform materials.Wells have been dug at A and
A)1 year
B)2 years
B)Testing has shown the flow of groundwater to be 4 km/yr.If the people at A dump a pesticide into their well,how long will it probably take before well B becomes contaminated? The vertical exaggeration on this diagram is 10x.
C)4 years
D)10 years