Betty and Tracy planned a 5000km trip in an automobile with five tires, of which four are in use at any time. They plan to interchange them so that each tire is used the same number of kilometers. What is the number of kilometers each tire will be used?

Question

anonymous · Answer

350km for each tire.

nottim · Answer

Hmm. A real brain stumper.

apoorvk · Answer

4000 kms each.

divide the journey into 5 legs. so each tyre was active for 4 legs of the journey.

phi · Answer

there are 4*5000  = 20000 tire-km  shared over 5 tires or 4000 km per tire