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?
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: $$ 9:00 \text{ am} + 15 \text{ minutes} = 9:15 \text{ am} $$
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