Question 5
Alice and Bruce took different trains at same station. The constant speed of Alice’s train is 90 km per hour and the constant speed of Bruce’s train is 72 km per hour. 20 minutes after Bruce’s train departed, Alice’s train has also departed. At a certain moment in their journey, Bruce’s train travelled 15 km more than Alice’s train. What was the total distance, in km, that Bruce’s train had travelled at this moment? (Assume that the speeds of the trains remain the same even when the trains are leaving the station.)