Question
Train ‘A’ running with a speed of 108 km/hr can
cross a standing goods train of 4 times its length in 20 seconds. Find the time taken by 200 metres long train ‘B’ which is coming from opposite direction of train ‘A’, with a speed of 12 m/s, to cross train ‘A’.Solution
Let the length of train ‘A’ be ‘x’ metres Therefore, length of the goods train = ‘4x’ metres Speed of train ‘A’ = 108 × (5/18) = 30 m/s According to the question, 4x + x = 30 × 20 => 5x = 600 => x = 120 Therefore, time taken by train ‘B’ to cross train ‘A’ = {(120 + 200)/(20 + 12)} = 10 seconds
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Find the missing number, in the given number series.
42, 52, 72, 112, 192, ?
[(145)² ÷ 25 × 52] ÷ ? = 29 × 13
- What will come in place of (?) in the given number series.
121, 100, 81, 64, ?, 36 143 119 107 101 98 ?
Choose the missing term?
B, D, F, I, L, P, ?
32, 42, 62, 92, ?, 182
What value should come in the place of (?) in the following number series?
64, 80, 104, ?, 176, 224
- 6, ?, 9816, 9825, 19429, 19438
900 90 18 ? 2.16 1.08
- What will come in place of the question mark (?) in the following series?
10, 17, 26, 37, 50, ?
