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Let the speed of boat in still water =B and speed of stream =S then – ATQ- 
B-S =6 … (2) Solving (1) +(2) 2B =18 B=9km/h and S=3km/h.
3, 4, 10, 33, 136, ?, 4116
36, 49, 23, 62, ?, 75
47 82 117 152 187 ?
76, 82, 158, 240, 398, 638, ?
41 48 89 137 226 ?
...95 186 376 748 1500 ?
...45 47 97 296 ? 5966
95 110 128 ? 181 222
...Select the option in which the numbers are related in the same way as are the numbers of the following set.
(25, 18, 225)
19 8 ? -14 63 - 36
...