Trains leave Chennai for Bengaluru every 40 minutes at 72 km/h. A car on the highway alongside travels from Bengaluru towards Chennai at 48 km/h. How often does the car meet one of these trains?

Question

Accepted Answer

Every 24 minutes. Trains are 72×40/60=48 km apart. Car and trains close at 72+48=120 km/h, so the gap is closed every 48/120 h = 24 min. (2 hours would apply if the car went the same way.)

Trains leave Chennai for Bengaluru every 40 minutes at 72 km/h. A car on the highway alongside travels from Bengaluru towards Chennai at 48 km/h. How often does the car meet one of these trains?

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