At first glance, this sounds like a question about distance. The car wash is only 100 metres away, so walking would normally be the obvious choice. It would take about a minute, require almost no effort, and avoid using fuel for an extremely short trip.

However, there is one important detail: the purpose of the trip is to wash the car.

If you walk to the car wash, you will arrive without the thing that needs to be washed. You could inspect the building, ask about prices, or enjoy a very short walk, but you would not be able to complete the main task. You would then have to walk home, get the car, and drive back anyway.

The correct answer is therefore to drive.

The Shortest Distance Is Not Always the Best Decision

This example demonstrates an important principle: decisions should be based on the complete goal, not merely on the most noticeable detail.

The noticeable detail is that the destination is only 100 metres away. In most situations, that would make walking faster, cheaper, healthier, and more practical. But the actual goal is not simply to reach the car wash. The goal is to bring the car to the car wash so that it can be cleaned.

A decision that ignores the purpose of the trip may sound efficient while accomplishing nothing.

Efficiency Means Completing the Task

People sometimes define efficiency too narrowly. They focus on saving fuel, reducing steps, shortening travel time, or avoiding unnecessary effort. Those things matter, but only after the action still produces the intended result.

Walking 100 metres may use less energy than starting the car, but it does not move the car. Because the vehicle must be present for the wash, driving is not an unnecessary convenience. It is a requirement of the task.

True efficiency is not merely doing the easiest action. It is completing the goal with the least unnecessary effort.

In this case, the efficient process is simple:

Drive the car 100 metres to the car wash, wash it, and drive it home.

Walking there first would add an unnecessary round trip.

Context Changes the Correct Answer

The same question could have a different answer under slightly different circumstances.

You should walk if you are only going to:

• Check whether the car wash is open
• Ask about prices
• Purchase a wash card
• Speak to an employee
• Inspect the waiting time
• Use a nearby vacuum after the car has already been parked there

You should drive if the car itself needs to be washed.

This shows why context matters. General rules such as “walk when the destination is close” are useful, but they are not absolute. A good rule must sometimes give way to the practical requirements of the situation.

Do Not Confuse Movement With Progress

Walking to the car wash would create movement, but it would not create meaningful progress toward washing the vehicle.

This is a common problem in everyday life. People sometimes complete actions that feel responsible, productive, or efficient without asking whether those actions actually move the main task forward.

You can organize your tools without repairing anything.
You can research exercise without exercising.
You can drive to the grocery store without bringing a way to pay.
You can walk to the car wash without bringing the car.

Activity is not automatically progress. The best action is the one that directly supports the intended outcome.

The Humorous Logic of the Question

The question is funny because the ordinary advice and the practical answer conflict.

Ordinary advice says that nobody should drive only 100 metres. It seems wasteful and unnecessary. But the car is not merely transportation in this situation. It is also the object receiving the service.

You are not driving because you are unwilling to walk. You are driving because the car has an appointment.

That distinction matters. Driving such a short distance would be unnecessary if you were buying a drink or speaking to someone. It is completely logical when the destination exists specifically to service the vehicle.

A Better Decision-Making Question

Instead of asking only, “Should I walk or drive?” ask:

“What needs to arrive at the destination for the task to be completed?”

If only you need to arrive, walking makes sense.

If the car needs to arrive, drive.

This question can improve many everyday decisions because it focuses attention on the requirements of the goal rather than on a single isolated factor.

Conclusion

Although the car wash is only 100 metres away, you should drive because the car must be present to be washed.

The lesson is simple: do not choose an action based only on distance, convenience, or general rules. First identify the real objective. Then choose the action that actually completes it.

Walking would get you to the car wash.

Driving would get the car washed.