Two trains 150 m and 210 m long are running in opposite directions on parallel tracks at 45 km/h and 63 km/h. In how much time will they completely cross each other?

A. 10 seconds

B. 20 seconds

C. 12 seconds

D. 15 seconds

Doubtly AI Asked 27 Oct 2026 AI-generated · not yet verified ssc chsl Save WhatsApp Report

1 answer

Best answer

Answer: C. 12 seconds

Answer: (C) 12 seconds

Relative speed (opposite directions) \(= 45 + 63 = 108\) km/h \(= 108 \times \frac{5}{18} = 30\) m/s. Distance \(= 150 + 210 = 360\) m. Time \(= \frac{360}{30} = 12\) s.

Doubtly AI · 27 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?

Two trains 150 m and 210 m long are running in opposite directions on parallel tracks at 45 km/h and 63 km/h. In how much time will they completely cross each other?

1 answer

Your answer