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Let the length of the tunnel be ‘x’ meter. Speed = 72 × (5/18) m/sec = 20 m/sec Time = 1 minute = 60 seconds. Let the length of the tunnel be x metres. Then, (550 + x)/60 = 20 =>(550 + x) = 1200 => x = 650 m
Study the given pattern carefully and select the number that can replace the question mark (?) in it.
4 7 6
15 ? 21
44 68 60
If 7 16 x 90 171 292
4 5.5 19 .5 98.5 694 6251.5
...66 187 43 212 ? 241
64 66 76 126 376 ?
...412, 537, 573, 916, 980, ?
11, 9, 15, 41 ,157, 789
57 59 66 94 157 ?
...98 148 185 ? 228 238
625, 5, 125, 25, 25, ? , 5