Question
A boat, whose speed in still water is 25% more than the
speed of the current, covers 810 km downstream in _____ hours. The speed of the boat in still water is ______ km. The values given in which of the following options will fill the blanks in the same order in which is it given to make the statement true: I. 18, 23 II. 12, 37.5 III. 18, 30Solution
Downstream speed of the boat = x + 1.25x = 2.25x km/hr For I: 2.25x = 810/18 => 2.25x = 45 => x = 20 Therefore, speed of boat in still water = 1.25x = 25 km/hr Therefore, I is false. For II: 2.25x = 810/12 => 2.25x = 67.5 => x = 30 Therefore, speed of boat in still water = 1.25x = 37.5 km/hr Therefore, II is true. For III: 2.25x = 810/18 => 2.25x = 45 => x = 20 Therefore, speed of the boat in still water = 1.25x = 25 km/hr Therefore, III is false.
52, 77, 127, ?, 302, 427
840, 2520, 630, 3150, ?, 3675
188    178    158   ?     88    38
5, 18, 39, 68, 105, ?
7, 176, ?, 378, 427, 452
...What will come in place of the question mark (?) in the following series?
22, 28, 37, ?, 72, 102
84, 63, ?, 283.5, 1701
64, 80, 120, 210, ?, 945
What will come in place of the question mark (?) in the following series?
40, 25, 30, 50, 105, ?
Which of the following number will replace the question mark (?) and complete the given number series?
4, 5, 12, 39, 160, ?
