Question
A boat covers a distance of 150 km while moving in a
downstream in 5 hours. When the boat covers a distance of 60 km in still water in 3 hours, then What will be the distance covered by boat (in km) in upstream in 8 hours.Solution
Let the speed of the boat in still water and speed of the stream will be taken as 'x' km/hr & 'y' km/hr respectively. ATQ,we can say that Speed of the boat in downstream = (x + y) = (150/5) = 30km/hr ....(I) Also, 'x' = (60/3) = 20.....(II) So, from equation (II), we can say that 20 + y = 30 Or, y = 10 So, distance covered in upstream will be = (x - y) x 8 = (20 - 10) x 8 = 80km
6Â Â Â Â Â Â Â Â Â Â Â Â Â 16Â Â Â Â Â Â Â Â Â Â 116Â Â Â Â Â Â Â Â 566Â Â Â Â Â Â Â Â 2272Â Â Â Â Â Â 6814
13       a  �...
1, 27, ?, 343, 729, 1331
1Â Â Â Â 1Â Â Â Â 8Â Â Â Â 4Â Â Â Â 27Â Â Â Â 9Â Â Â Â ?
...To find the Next number in the given series.
6 9 13 19 29 47 ?
...12, 6, 6, 9, 18, ?
27   44    63    86   ?      146
22, 23, 31, 57, 122, 247
32, 128, ?, 2048, 8192, 32768
13Â Â Â Â Â Â Â Â Â Â 182Â Â Â Â Â Â Â Â 303Â Â Â Â Â Â Â Â 384Â Â Â Â Â Â Â Â 433Â Â Â Â Â Â Â Â ?
...14 15 34 116 460 2325
...
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