Question
A man swims 2km/h against the stream and goes 1 km in 10
minutes along the stream, how much time will it take to cover 5 km in still water?Solution
Let the speed of boat in still water =B and speed of stream =S then – ATQ- B-S= 2km/h    … (1) B+S=1/10 km/minutes B+S=6 km/h Solving (1) +(2) 2B=3+6=8 B=8/2=4km/h Take the time cover 5 km in still water = 5/4 =5/4 h.
1Â Â Â Â 1Â Â Â Â 8Â Â Â Â 4Â Â Â Â 27Â Â Â Â 9Â Â Â Â ?
...72 85 103 126 154 ?
...15 12 ? 9 21 6
...53 ? 55 49 57 47
...There are two series I and II. Logic in both the series are different.
Series l: 3, 12, 28, 53, 89, .
Series II: 259, 270, 283, 300, 319.<...
15Â Â Â Â Â Â Â Â Â Â Â Â 13 Â Â Â Â Â Â Â Â 28 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 24 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 54 Â Â Â Â Â Â Â Â 52
...1331      1000            729       512       ?             216
...20    60      180      540     ?     4860
...27   44    63    86   ?      146
24, 33, 50, ?, 108, 149
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