Question
The speed of the stream is 11 km/h. Boat ‘A’ covers
84 km distance against the stream in 6 hours and boat ‘B’ covers 90 km distance against the stream in 3 hours. The speed of boat ‘B’ in still water is how much percent of the speed of boat ‘A’ in still water?Solution
Speed of boat ‘A’ upstream = 84/6 = 14 km/h Speed of boat ‘B’ upstream = 90/3 = 30 km/h Speed of the boat ‘A’ in still water = 14 + 11 = 25 km/h Speed of the boat ‘B’ in still water = 30 + 11 = 41 km/h Required percentage = (41/25) × 100 = 164%
- What will come in place of (?), in the given number series.
1, 4, 9, 16, ?, 36 {(12√5 + 6√5 )} ×{(10√5 - 5√5 )} - 8² + 6² = ?
11          20          ?             64          112        192
...350 435 367 ? 384 401
...0, 6, 24, ?, 120, 210
21, 37, 73, 137, ?, 381
What will come in place of the question mark (?) in the following series?
4, 11, 32, 95, 284, 851, ?
18, 34, 70, 134, ?, 378
120, 136, 111, 147, ?, 162
What will come in place of the question mark (?) in the following number series?
124, 131, 117, ?, 110, 145
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