Question
A boat goes 40km upstream in 8 hours and 36km downstream
in 6 hours. The speed of the boat in still water.Solution
Let the speed of boat in still water =B and speed of stream =S Speed of boat in downstream B+S=36/6=6km/h Speed of boat in upstream =B-S=40/8=5km/h Now Speed of boat in still water B= (6+5)/2 =11/2=5.5km/h
4, 5, 11, 34, 137, ?
216, 81, 297, 378, ?, 1035, 1728
What will come in place of (?) question mark in the given number series.
960, 960, 480, ?, 40, 8
What will come in place of the question mark (?) in the following series?
12, 13, 27, ?, 329, 1646
864, 432, 144, ? , 7.2, 1.2
What will come in place of the question mark (?) in the following number series?
29, 30, 33, ?, 69, 150
What will come in place of the question mark (?) in the following series?
47, 56, 120, 145, ?, 410
30          162        344        ?             890        1270
...70, 69, 73, 64,80, 55, ?
120, 136, 111, 147, ?, 162
