Question
Train ‘A’ travelling with a speed of 84 km/h can
cross a pole in 12 seconds. If the length of train ‘B’ is 20% less than that of train ‘A’ and it can cross a pole in 21 seconds then speed (in km/h) of train ‘B’ is:Solution
Speed of train ‘A’ = 84 × (5/18) = (70/3) m/s Length of train ‘A’ = (70/3) × 12 = 280 metres Length of train ‘B’ = 0.4 × 280 = 224 metres Speed of train ‘B’ = (224/21) × (18/5) = 38.4 km/h
Complete the series choosing the missing number.
110, 99, 86, ___, 54, 35.
64, 32, 48, 120, 420, ?
What will come in place of the question mark (?) in the following series?
112, 124, 138, 154, ?, 196
12 ? 545 2729 10919
What will come in place of (?) question mark in the given number series.
22, 23, 19, 28, ?, 37
8    12    39      ?       180    216
...What will come in place of the question mark (?) in the following series?
4, 11, 32, 95, 284, 851, ?
12, 27, ?, 113, 141, 285, 313
53 × 38 + 32 × âˆ›54872 = ?
What will come in place of the question mark (?) in the following number series?
21, 42, 67, 96, ?, 166
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