Question
A boat can travel 28 km downstream in 30 min. The ratio
of the speed of the boat in still water to the speed of the stream is 5: 3. How much time will the boat take to cover 30 km upstream?Solution
Speed of downstream = D/T = 28 × (60/30) = 56 km/hr The ratio of the speed of the boat in still water to the speed of the stream = 5: 3 (5x, 3x) => 8x = 56 => x = 7 Speed of upstream = 5x – 3x = 2x = 14 km/hr Distance = 30 km Time = D/S = 30/14 = 2(1/7) hrÂ
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12, 13, 27, 82, 329, ?
12   18   31   51   ?   112
252, 128, 66, 35, 19.5, ?
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6, 19, 45, ?, 136, 201 7    8     ?     13     17     22    28
...11, ? 220,  660, 1320,  1320Â
3   2   3   6   14    ?    115.5
Find the missing number, in the given number series.
25, 30, 40, 57, ?, 120
98, 134, 198, ?, 442, 638
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