Question
Two trains of equal lengths take 20 seconds and 30
seconds respectively to cross a telegraph post. If the length of each train be 360 metres, in what time will they cross each other travelling in opposite direction?Solution
Speed of the first train = [360/20] m/sec = 18 m/sec Speed of the second train = [360/30] m/sec = 12 m/sec Speed = (18 + 12) m/sec = 30 m/sec Required time = (360 + 360)/30 sec = 24 sec
155, 157, 160, ?, 172, 183
12, 14, 20, 32, ?, 82
1221, 1100, 1000, 919, ?
...What will come in place of the question mark (?) in the following series?
75, 219, 388, ?, 809, 1065What will come in place of the question mark (?) in the following number series?
21, 42, 67, 96, ?, 166
18, 22, 28, 38, 54, ?,
17, 9, ?, 13.5, 25, 65
What will come in the place of questions (?) mark in the following questions.
160, 223, 271, 306, 330, ?
12, 33, 45, 78, 123, 201, ?
What will come in place of the question mark (?) in the following series?
45, 68, 114, 183, 275, ?
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