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Distance travelled by train A in 30 min = 32/2 = 16 km Therefore, the remaining distance = 620 – 16 = 604 km Relative speed of the trains = 32 + 38 = 70 km/hr. Time = 11:30 p.m. – 9:00 a.m. = 5/2 hrs. Distance covered by both the trains = 70 × 5/2 = 175 km Distance between both the trains at 11:30 p.m. = 604 – 175 = 429 km
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