Sail the boat
Two boatmen start simultaneously from the opposite shores of a river and they cross each other after 45 minutes of their starting from the respective shores. They rowed till they reached the opposite shore and returned immediately after reaching the shores. When will they cross each other again?
The answer is 90.
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1 solution
After another 45 minutes, they both reach the opposite shores. And if they come back at the same rate, they'll meet each other in another 45 minutes. That makes a total of 90. Hence, they would meet after 90 minutes from the instance they first met.