A boat running downstream covers a distance of 36 km in 6 hrs and covering the same distance upstream in 9 hrs. What is the speed of a boat in still water?
Downstream speed = 36/6 = 6 km/hr Upstream speed = 36/9 = 4 km/hr So speed of boat in still water = (6 + 4)/2 = 5 km/hr
4 5.5 19 .5 98.5 694 6251.5
...15 13 28 24 54 52
...1 5 13 25 41 ?
31 48 67 90 ? 150
100 221 77 245 50 275
3601 3602 1803 604 154 36
...2, 17, 147, 1167, 8157, 48957
D irection: Which of the following will replace ‘?’ in the following series
9, ‘?’, 1242, 1581, 1783
...2120 1976 2097 1997 ? 2014
...4 6 12 ? 44 74
...
