Question
A train takes 22 seconds to cross a platform and 9
seconds to cross a pole. If the length of the train is 50 metres less than the length of the platform, then find the length of the platform.Solution
ATQ, Let the speed of the train be ‘x’ m/s. Length of the train = 9 × x = ‘9x’ metres So, length of the platform = (9x + 50) metres ATQ; (9x + 50 + 9x) ÷ 22 = x Or, 18x + 50 = 22x Or, 50 = 4x So, x = 12.5 Therefore, length of the platform = (12.5 × 9) + 50 = 162.5 metres
1500 Â Â Â 150Â Â Â 30Â Â Â ? Â Â Â Â 3.6Â Â Â Â 1.8
32, 52, 82, 124, 180, ?
625, 125, 375, 75, 225, 45, ?
What value should come in the place of (?) in the following number series?
71, 72, 76, 103, ?, 244257, 399, 566, ?, 983, 1237Â
31    32      35      ?      47       56
...What will come in place of the question mark (?) in the following series?
206, 187, ?, 157, 146, 139
- Find the missing number in the given number series.
42, 37, 45, 40, 48, ? 13, 29, 65, 129, ?, 373
What will come in place of the question mark (?) in the following series?
130, 158, 214, 298, ?, 550
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