Let the distance to be travelled be ‘x’ km Time taken when speed is 10 km/hr = (x/10) hours Time taken when speed is 15 km/hr = (x/15) hours According to the question, (x/10) – (x/15) = 2 Or, 3x – 2x = 2 × 30 Or, x = 60 km Time taken to travel 60 km with speed of 10 km/hr = 60/10 = 6 hours Therefore, he started at 12 – 6 = 6 a.m. Therefore, required speed to reach the destination at 11 a.m. or 5 hours = 60/5 = 12 km/hr
5, 14, 41, 122, 365, 1094, ?
342Â Â Â 252Â Â Â 172Â Â Â 102Â Â Â 42Â Â Â ?
17Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 26Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 37Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â...
4Â Â Â Â Â Â Â 5Â Â Â Â Â Â Â 9Â Â Â Â Â Â Â 27 Â Â Â Â Â Â ? Â Â Â Â Â Â Â 723
...18Â Â Â Â Â Â Â Â Â Â Â Â 29 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 51 Â Â Â Â Â Â Â Â 84 Â Â Â Â Â Â Â Â 128 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 182
3720 3842 ? 4092 4220 4350
D irection: Which of the following will replace ‘?’ in the following series
460, 462, ‘?’, 467.5, 470.97
...148, ‘?’ , 15 4 , 17 8 , 23 8 , 35 8 , 56 8
105   107   111   114   ?   127
?, 8, 32, 72, 128, 200
