A train crosses Park Street every forty-five minutes. About 15 minutes ago, one train has crossed Park Street, and the next train will be crossing Park Street by 9.45 am. What is the time now?
Step-by-step Solution:
The train crosses every 45 minutes. If the next train is at 9:45 am, the previous train crossed exactly 45 minutes before that. $$ 9:45 \text{ am} - 45 \text{ minutes} = 9:00 \text{ am} $$ The statement says "15 minutes ago, one train has crossed". This means the previous train crossed at 9:00 am, which was 15 minutes ago. Therefore, the current time is: $$ 9:00 \text{ am} + 15 \text{ minutes} = 9:15 \text{ am} $$