Bite-sized brain teaser to solve in a minute or less.
The Average Speed Trap
Category: Logical Reasoning / Light Math
You drive 60 miles to a destination at 30 mph.
How fast must you drive back to average 60 mph for the entire trip?
A) 90 mph
B) 120 mph
C) Impossible
Solution
|
At 30 mph, the first 60 miles takes 2 hours. To average 60 mph over 120 miles, you'd need to complete the entire trip in 2 hours total. You've already used those 2 hours. Answer: C) Impossible |
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