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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
50 62 ? 96 126 138
...35.25 71 146 296 624 1376
...24 25 46 ? 572 2885
...13 22 40 67 103 ?
...18 29 51 84 128 182
There are three series given below which are following with the same pattern.
Series I: 1, 12, 38, 193, 1355
Series II: 6, B, C, D, E
...30 32 67 206 ? 4166
3 ? 7 16 71 346
...20 21 30 55 104 ?
462 478 510 558 ?
...