Question
Two trains of equal lengths take 15 seconds and 30
seconds respectively to cross a telegraph post. If the length of each train be 180 metres, in what time will they cross each other travelling in opposite direction?Solution
Speed of the first train = [180/15] m/sec = 12 m/sec Speed of the second train = [180/30] m/sec = 6 m/sec Speed = (12 + 6) m/sec = 18 m/sec Required time = (180 + 180)/18 sec = 20 sec
8Â Â Â 8Â Â Â 12Â Â Â 24Â Â Â Â 60Â Â Â Â Â ?
64, 66, 69, 74, 81, ?
What value should come in the place of (?) in the following number series?
5, 16, 51, 158, 481, ?, 4367
What should come in place of (?) question mark in the following number series.
1, 2, 6, 24, 120, ?
- What will come in place of the question mark (?) in the following series?
712, ?, 576, 508, 440, 372 What will come in place of the question mark (?) in the following series?
48, 291, ?, 399, 408, 411
126 56 ? 12 10 2
...What will come in place of (?) in the following number series problems?Â
90, 84, 120, 113, 162, ?, 218Â
In each of the following number series, one term is missing. Find the missing term.
1, 4, 9, 16, 25, ?
(14.073)² + (32.103)² + (43.9653)² + (52.983)² + ? = (102.45)² + (98.007)²
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