Bite-sized brain teaser to solve in a minute or less.
Forward and Backward
Category: Motion, Reasoning
Jerry needs to reach a door exactly 10 steps away from him. But he can only walk 5 steps forward and then 3 steps backward repeatedly until he reaches his destination. Each step is the same length. Exactly how many steps does Jerry have to take to get to the door?
Solution
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Every cycle consists of 8 steps, gaining 2 steps forward (5 forward – 3 back). To get to 10 steps from his starting point, Jerry must walk a total of 40 steps. |
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1 comment
That’s wrong. It’s 28 steps. Once he does the 8 step cycle (5 forward, 3 back) 3 times, he is 4 steps from his destination. If he goes 5 steps forward again, he will have passed it.