Question
Speed of a Motorboat in still water is 75kmph. If the
motorboat travels 150 km along the stream in 1 hour 40 minutes, then the time taken by it to cover the same distance against the stream will be?Solution
Let the speed of the current be x kmph Rate Downstream = (x + 75) kmph According to the question : 150/(x+75) = 1 hour 40 minutes 150/(x+75) = 5/3 hours 450= 5x + 375 5 x = 450 – 375 X= 15 kmph Rate Upstream = 75 – 15 = 60 kmph Required time = 150/60 = 2 hours 30 minutes
188 178 158 ? 88 38
What will come in place of the question mark (?) in the following series?
102, 111, 136, 185, 266, ?
1140, ?, 1130, 1160, 1120, 1170
864, 432, 144, ? , 7.2, 1.2
What value should come in the place of (?) in the following number series?
251, 272, 296, ?, 353, 3867 29 61 ? 211 349
...48 49 45 54 ? 63 27
...10, 10, 15, 30, 75, ?
What will come in place of the question mark (?) in the following series?
100, 729, 64, 343, 36, ?
3.6 × 1.5 + 8.4 × 2.5 – 9.2 × 3.5 = ? – 9.2 × 4.4
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