Question
A boat, whose speed in still water is 25% more than the
speed of the current, covers 315 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. 20, 8 II. 10, 17.5 III. 14, 12.5Solution
Let, the speed of the current be x km/hr Therefore, speed of the boat in still water = 1.25x km/hr Downstream speed of the boat = x + 1.25x = 2.25x km/hr For I: 2.25x = 315/20 => 2.25x = 15.75 => x = 7 Therefore, speed of boat in still water = 1.25x = 8.75 km/hr Therefore, I is false. For II: 2.25x = 315/10 => 2.25x = 31.5 => x = 14 Therefore, speed of boat in still water = 1.25x = 17.5 km/hr Therefore, II is true. For III: 2.25x = 315/14 => 2.25x = 22.5 => x = 10 Therefore, speed of the boat in still water = 1.25x = 12.5 km/hr Therefore, III is true.
- In the given number series, find the wrong number.
5, 10, 15, 20, 25, 31, 35 3, 6, 18, 90, 630, 5670
Find the wrong number in the given number series.
65, 91, 130, 182, 286, 429
- Find the wrong number in the given number series.
10, 21, 14, 25, 18, 30 Find the wrong number in the given number series.
3, 8, 15, 24, 35, 50
Find the wrong number in given number series.
1687, 1666, 1618, 1549, 1457, 1342.
- Find the wrong number in the given number series.
12, 21, 5, 38, 2, 71 - Find the wrong number in the given number series.
2, 27, 252, 877, 2102, 4127 Find the wrong number in the given number series.
740, 725, 680, 605, 595
Find the wrong number, in the given number series,
24, 48, 88, 144, 224, 304
Relevant for Exams:
