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Let the speed of the stream = 'k' km/h Then, upstream and downstream, speed of the boat are (30 - k) km/h and (30 + k) km/h, respectively According to the question, 30 + k = (30 - k) X 1.5 Or, 30 + k = 45 - 1.5k Or, 2.5k = 15 So, k = 6 Therefore, speed of the stream = 6 km/h
16 25 36 49 64 ?
5, 18, 39, 68, 105, ?
-1, 5, 23, 59, ?
58, 67, ?, 76, 40, 85
188 178 158 ? 88 38
Which of the following number will replace the question mark (?) and complete the given number series?
4, 5, 12, 39, 160, ?
418, 406, 430, 382, 478, ?, 670
12, 11, 20, 57, 224, 1015
216, 81, 297, 378, ?, 1035, 1728
8, 9, 125, ?, 1331, 169