Question
A train 450 metres long is running at a speed of 54
km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is:Solution
Let the length of the tunnel be ‘x’ meter. Speed = (54 × (5/18) m/sec = 15 m/sec Time = 1 minute = 60 seconds. Let the length of the tunnel be x metres. Then, (450 + x)/60 = 15 =>(450 + x) = 900 => x = 450 m
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) = ?
