Question
Shiyun and Billy have a bicycle race. Shiyun cycles at a speed of 15 km/h. Billy cycles at a speed of 25 km/h. If Billy lets Shiyun start 40 min before him, how long will Billy take to catch up with Shiyun?
3 m

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Shiyun and Billy have a bicycle race. Shiyun cycles at a speed of 15 km/h. Billy cycles at a speed of 25 km/h. If Billy lets Shiyun start 40 min before him, how long will Billy take to catch up with Shiyun?