The optical illusion challenged drivers to decide which of these four cars would get fuel first.
The image, originally posted on X, shows the engines connected to a central fuel tank by a complex system of pipes and tanks.
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Only genius drivers can tell which of these four cars will get fuel firstCredit: X/WorldofEngineering
On the left, cars A and B are connected by a common reservoir to which one pipe leads each.
A similar setup applies to C and D, but this time with the addition of an additional tank below.
The structure acts a bit like a fountain – as the tank on top fills, fuel flows through pipes on the side and down towards the cars.
The trick is to determine which side of the tank will fill first and then which car will get fuel from that tank first.
This sparked a lot of discussion on social media, with users offering their own solutions in the comments.
One wrote: “B first, C second.”
Another added: “It depends on the flow rate.
“Given that A has a longer fuel distance, I would expect to be able to increase fuel and potentially fill up B first – shorter distance.”
Even Top Gear legend James May put forward a theory, saying: “B would dribble first, but A would fill first.”
And the TV star may have just succeeded, because Sun Motors thinks he’s right.
You have a high IQ if you can spot a car breaking a basic road rule in less than 30 seconds
The upper tank would send fuel equally to the tank of both sides, but C and D can be eliminated because it would be poured straight into the lower tank on that side.
Even a small amount of fuel getting into C as it trickled down the tank wall wouldn’t put it in first place because the pipe connecting it is much longer than for B.
As such, B will first receive a small amount of fuel as it flows down the tank wall on the left side.
However, car A would be the first to actually refuel because the entrance to its pipe is closer to the bottom of the tank than car B.
This means that as the left tank fills, fuel will begin to pour into A and rise high enough to pour into B in any significant amount.
Assuming a constant flow rate, A will fill faster than B.
It comes after drivers were tested with a range of other car-related brain teasers.
For example, anyone can see the little girl in this picture, but only those with eagle eyes can understand what is really going on.
Likewise, you have the eyes of a hawk if you can spot all the animals in this picture in 15 seconds.
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While B can leak, A is the first to fill Credit: X/WorldofEngineering
Categories: Optical Illusion
Source: HIS Education