Question
The speed of a boat in still water is 6 km/hr more than
that of the current. The time taken by the boat to cover 925 km downstream is 18.5 hours. Find the total time taken by boat to travel 750 km downstream and 45 km upstream.Solution
Therefore, downstream speed of the boat = 925/18.5 = 50 km/hr And, upstream speed of the boat = 6 km/hr Required time taken = (750/50) + (45/6) = 15 + 7.5 = 22.5 hours
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
