Question
A train crosses a pole and a platform of length 672
metres in 14 seconds and 30 seconds, respectively. Find the length of train.Solution
Let the speed of train be 'v' m/s.
Length of train = '14v' metres
So, (14v + 672) ÷ 30 = 'v'
Or, 14v + 672 = 30v
Or, 16v = 672
So, 'v' = 42
Therefore, length of the train = 14 × 42 = 588 metres
77 ? 190 257 331 412
...5 10 40 80 320 640
4 a b c d e
Find the value of d.
...If  204    196       223   x  284
Then, what is the average of the numbers of the above series?
...18Â Â Â Â Â Â Â Â Â Â 434Â Â Â Â Â Â Â Â 642Â Â Â Â Â Â Â Â 746Â Â Â Â Â Â Â Â 798Â Â Â Â Â Â Â Â ?
...40 41 86 ? 1084 5445
...7 15 44 89 ? 533
...98    219    75    244    ?    273
If  7     43    x     1311    5247       15739
Then, x - x/2 + 2 = ?
...15     12    ?     9     21     6
...30 29 91 446 ? 28217
