Question
Two trains of equal lengths take 10 seconds and 15
seconds respectively to cross a telegraph post. If the length of each train be 240 metres, in what time will they cross each other travelling in opposite direction?Solution
Speed of the first train = [240/10] m/sec = 24 m/sec Speed of the second train = [240/15] m/sec = 16 m/sec Speed = (24 + 16) m/sec = 40 m/sec Required time = (480 + 480)/40 sec = 12 sec
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...What will come in place of the question mark (?) in the following series?
81, 83, 87, 95, 111, ?
48, 24.5, ?, 39.75, 81.5, 206.25, 621.75
What value should come in the place of (?) in the following number series?
14, 18, ?, 43, 68, 104
14, 20, 29, 44, 65, ?
16, 16, 32, 96, ?, 1920
What will come in place of (?) Question mark in the given number series.
500, 489, 467, 434, 390, 335, ?
72, 79, 100, 135, 184, ?
79Â Â Â Â Â 86Â Â Â Â Â Â 76 Â Â Â Â Â Â 89Â Â Â Â Â Â 73 Â Â Â Â Â Â ?
...290, 571, 900, ?, 1485, 1890
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