A train leaves Station A heading east at 60 mph. One hour later, another train leaves Station A heading west at 40 mph. How far apart are the two trains 2 hours after the second train starts moving?
260 miles
The first train travels for 3 hours total at 60 mph, covering 180 miles east. The second train travels for 2 hours at 40 mph, covering 80 miles west. Traveling in opposite directions, the total distance between them is 180 + 80 = 260 miles.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Easy. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
More logic riddles
A cylindrical barrel is half full of honey. Its total weight with the honey is 50 kilograms. When empty, the barrel weighs 10 kilograms. What is the total weight of the barrel when it is completely full of honey?
Four people need to cross a rickety rope bridge at night. They have only one flashlight, and the bridge can hold at most two people at a time. Their walking speeds are 1, 2, 7, and 10 minutes. What is the absolute minimum time required for all four to cross?
On a balance scale, two identical square blocks balance perfectly with one circle block and one triangle block. Also, one circle block balances perfectly with one square block and one triangle block. How many triangle blocks are needed to balance exactly one square block?
Four people need to cross a rickety rope bridge at night. They have one flashlight. The bridge can hold at most two people at a time. Their crossing times are 1, 2, 5, and 10 minutes. When two cross, they walk at the speed of the slower person. What is the minimum time required for all four to cross?
Look at this sequence of numbers: 2, 4, 8, 16, 32, __. What is the next number?
You have five coins: three are genuine gold coins of equal weight, and two are lighter counterfeit coins of equal weight. Using a balance scale just once, how can you guarantee identifying at least one genuine gold coin?