Downstream Speed = (13 + 5) km/hr = 18 km/hr Time taken = 54/18 = 3 hours
350 35 7 ? 0.84 0.42
4, 4, 12, 60, ?, 3780
1 12 31 58 93 ?
36 37 33 42 ? 51 15
13, 55, 111, 183, 273, ?
12, 33, 45, 78, 123, 201, ?
2, 6, ?, 20, 30, 42
12 18 31 51 ? 112
43, 56, 82, ?, 173, 238
18, 34, 70, 134, ?, 378
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