एक ट्रेन 1 सितंबर 2019 को 04:48 बजे विशाखापत्तनम से प्रस्थान करती है और 2 सितंबर को 17:37 बजे अपने गंतव्य पर पहुँचती है। ट्रेन का कुल यात्रा समय कितना है?

Rohan walks around a circular field at the rate of 1 round per hour while Shreyas runs around it at the rate of 5 rounds per hour. They start in the same direction from the same point at 8:30 AM. When will they first cross each other?

In covering 90 km, R takes 4 hours more than S. If R triples his speed, then he would take 2 hours less than S. What is R's original speed (in km/h)?