Question
A train running with a speed of 45 km/hr can cross a
pole in 10 seconds and a platform in 20 seconds. Find the length of the platform.Solution
Speed of the train = 45 × (5/18) = 12.5 m/sec Length of the train = 12.5 × 10 = 125 metres Let the length of the platform be ‘x’ metres Therefore, 125 + x = 12.5 × 20 Or, x = 250 – 125 = 125 metres
165      155     135     ?     65      15
...3, 10, 29, 66, ?
What should come in place of (?) question mark in the given number series.
2, 6, 15, 31, 56, ?
What will come in place of (?) question mark in the given number series.
12, 27, 44, 65, ?, 139
120, 120, ?, 360, 900, 2700
What will come in place of (?) question mark in the given number series.
52, 61, 79, 106, 142, ?Â
In each of the following number series, one term is missing. Find the missing term.
7, 15, 31, 63, ?, 255
Find the missing number, in the given number series.
25, 30, 40, 57, ?, 120
What will come in place of the question mark (?) in the following series?
92, 153, 220, ?, 364, 443
(248 + 352)/(34 - 30) = ?
