Question
A train would take 20 seconds to cross a stationary
pole. If the train was 200m shorter, it would have taken 10 seconds less. Find the speed of the train.Solution
Let the original length of the train =  x m ∴ Speed of the original train = x/20 m/s ∴ Length of the shorter train = x-200 ∴ speed of the shorter train = (x-200)/10 m/s Since, both the train are same their speed are also same ∴ (x )/20 = (x-200)/10 ⟹ 10 x = 20 x- 4,000 10 x =4,000  x = 400 ∴ Speed = x/20 =400/20 = 20m/s
Find the missing term:
Study the given matric carefully and select the number from among the given options that can replace the question mark (?) in it.
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Select the number from among the given option that can replace the question mark (?) in the following series.
11, 18, 30, 52, 94, ?
M/14 : O/12 : : U/6 : ?
Select the number from the given option that can replace the question mark (?) in the following series:
32, 16, 24, 60, ?, 945
Study the given pattern carefully and select the number that can replace the question mark (?) in it.
 First row: 84, 42, 49
Second row: ...
Find the missing number from the given responses.
3 Â Â Â 5 Â Â Â 7
4 Â Â Â 6 Â Â Â 8
5 Â Â Â 7 Â Â Â 9
26...
Select the number that will replace the question mark (?) in the following series.
35, 38, 43, 50, 61, 74, ?
Find the missing number.
Select the number from the given option that can replace the question mark [?] in the following series.
515, 517, 520, 525, 532, 543, 556, ?
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