Question
Two boats A and B start towards each other from two
places, 432 km apart. Speed of the boat A and B in still water are 19 km/h and 17 km/h respectively. If A and B proceeds against and with the stream, respectively then after how much time will they meet?Solution
Let the speed of stream be ‘x’ km/h and they meet after‘t’ hours According to question, Distance covered while going upstream + Distance covered while going downstream = Total distance covered. (19 - x)t + (17 + x)t = 432 19t + 17t = 432 36t = 432 t = 12 hours
14, 17, 23, 32, ?, 59
32, 64, 8, ?, 2, 4Â
9 19 39 ? 159 319
18   29   16   31   ?   33
13, 29, 65, 129, ?, 373
47, 72, 122, ?, 297, 422
What will come in place of the question mark (?) in the following series?
24, 8, 15, ?, 12, 4
12, 18, 30, 54, ?, 198
What will come in place of the question mark (?) in the following series?
9, 22, 61, ?, 217, 334
4, 7, 12, 21, 36, ?