Trains and a Bee | PuzzledQuant

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New on YouTube: This HRT Quant Interview Question Has a One-Line Answer - Watch now

Get quant-ready in 2026

⚡ Build the skills to land top-paying quant jobs. Offer ends in 25d 09h 49m 33s25 days 9 hours 49 minutes 33 seconds.

Two trains are moving towards each other on the same straight track. They start 100 miles apart; one travels at 5 mph and the other at 15 mph. A bee flies back and forth between the two trains at 25 mph, starting at the faster train and turning around instantly each time it reaches a train. How many miles has the bee flown when the trains collide?